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PC troubleshooting: The place to start if your personal computer wont start

So youve made a decision to build your personal computer. Kudos for you when planning on taking on the best task in component customization we promise its a remarkably rewarding experience. However, when things fail as well as your PC wont start, it could feel demotivating and sometimes overwhelming to resolve.

Weve come up with a listing of the most typical reasons your home-built PC wont start and just how to resolve them efficiently.

PC wont start

PC power supply cables on a modular PSU.

This may function as most demoralizing of most PC fixing problems, as you dont have much to be on whenever your PC wont start. However, the truth that nothing happens is really a clue in and of itself. Somewhere across the chain of you pressing the energy button and power being sent to the components, theres an issue, and probably the most likely of these is that something isnt plugged in right.

So, first things first. May be the power cable connected to the wall and another end into your power? Will be the wall socket and PSU started up? Double-check each end to ensure everything is connected properly. Its also worth checking your motherboard and CPU power cables are plugged in correctly. To learn more on that, have a look at our comprehensive PC build guide.

If youre still getting nothing at all once you press the energy button, turn to see if your motherboard has any idle indicator lights to verify that the motherboard is certainly receiving power. Or even, then you may need a new power. Wed suggest swapping out the energy cable youre using, and perhaps trying another wall socket prior to going down that road, though. Should you choose need to purchase a new power, wed recommend these.

In case you are getting capacity to your motherboard, the following point to check on is your front-panel button is connected properly. Its different for each case, but most have a thin group of cables that run from your own front panel (which includes the energy button, indicator LEDs, and any front-panel I/O ports) and connects to a spot usually on the bottom-right of one’s motherboard.

PC front panel connectors.
Bill Roberson/Digital Trends

Remove your cases side panel and locate that cable. Make certain it runs to the motherboard and is well connected. The pin location and layout will change by case and motherboard, nonetheless it should appear to be a two-wide row of pins, usually encased in a plastic outer box.

The ends of the cables will say, for instance, HDD LED or PWR, plus some of these have negative and positive contacts. Make certain they are completely seated on the corresponding pin, that is either marked close to the pins on the motherboard, or in your motherboards documentation.

If in doubt, pull them out and plug them back again.

Theres noise or lights,but nothing appears on screen

If one’s body starts but doesnt boot, search below for the relevant section. But if once you hit the energy button, fans spin up and lights start while nothing appears on the screen, its most probably to become a hardware problem of some sort.

Before we start digging in to the system to attempt to find out whats wrong, ensure that you are protected as best you may be from static buildup. Which includes focusing on a set, non-conductive surface just like a wooden or plastic desk. Wearing shoes, if youre on carpet, isnt a negative idea either.

Ideally, youll have an anti-static wristband at hand, but or even, ensure that your systems PSU is switched off (it must be when youre focusing on it anyway) and periodically touch the case to ground yourself.

Check the monitor

It could seem a clear step, but youd be surprised how often its passed over. Be sure your monitor is plugged in and contains the right link with your personal computer. Check the indicator lights to see if the monitor is actually turning on. Make certain the monitor cable you’re using is working properly. Sometimes, although less frequently, brightness levels turned completely down could make a monitor look off when its not, so tweak the brightness along with other settings.

Diagnostic codes and beeps

Many modern motherboards will provide you with a concept of whats wrong once you learn where you can look and/or listen. If turning one’s body off offers you a number of particular beeps, or your motherboard includes a display onto it that shows a specific error code, use your motherboards manual to diagnose the issue.

Many of them is often as mundane as you forgot to plug in an electrical cable, while some will let you know your CPUis damaged and needs replacing. Each manufacturer uses different indicators to inform you what the thing is, so youll have to make reference to your documentation to translate the error code on your own machine.

Whether one’s body gives you a good error code or not, though, you may still find several different fixes you can test to sort the issue out.

SATA cable plugged into motherboard.

Is something shorting?

If one’s body powers up, the fans spin, the lights start, and everything turns off after half of a second, limited to it to repeat in a never-ending loop, there might be something metallic shorting out the machine somewhere.

A brief occurs whenever a component in something creates an improper electrical connection between components. For instance, a frayed wire may be brushing the motherboard, or perhaps a part of the case could be touching an element. Did you drop a screw behind the motherboard? Make certain all wires are intact, that no part of the case is directly contacting exposed PCB, and that the motherboard is installed in the event on standoffs that elevate it from the case surface.

It is a difficult problem to diagnose, especially from our perspective, if a system has these symptoms you need to probably keep a brief at heart.

The simplest way to make certain this isnt the case would be to take everything out and rebuild it outside the case, but thats an extreme measure. If you believe there could be an errant screw somewhere causing problems, tilting the case laterally will help you learn where it really is.

Reset the CMOS

Its likely that rather than a hardware problem, youre facing a weird compatibility problem or settings error in your systems BIOS. Thats the code that runs before your operating-system begins and helps configure the PC for use. If that is evoking the problem, its a comparatively easy fix.

If your motherboard includes a CMOS reset switch or button, use that make reference to your motherboard manual for instructions on how to utilize it.

Otherwise, youll desire to take away the power cable from your own PC, then locate the flat, silver battery on the motherboard itself. Take it off, press and contain the power button on your computer for 30 seconds, and plug the battery and the energy cable back and try again.

If your motherboard is over the age of your CPU, they could likewise have some small compatibility conditions that are preventing your personal computer from starting. You need to focus on updating the BIOS entirely if it appears like this may be a concern.

Note: In the event that you had any custom BIOS settings like fan profiles, overclocking, or specific drive configurations, you will have to redo those settings.


Attaching the 24-pin power connector to a motherboard.

There are a great number of different power plugs in something, and its own all too an easy task to miss one of these whenever your PC wont start. Probably the most common may be the 4/8-pin connector close to the CPU. Theres already a broad 24-pin connection, that you also needs to check, but plenty of builders forget the smaller CPU power connection.

Then, just tell you another parts in the PC and make certain theres power running from the energy supply to each one of these. In an average build, which means hard disks and optical drives, nonetheless it could also add a PCIe expansion or graphics card. When you have a modular power, also ensure all the cables are connected to the correct i’m all over this the PSU and so are running to the proper component.

If everything is plugged in correctly, consider unplugging everything however the essentials and attempting to start the PC again. If it works, it is possible to gradually plug everything back and find out what could be responsible. The components that you’ll need at the very least are:

  • Motherboard 24-pin and 4/8-pin power cables.
  • CPU cooler.
  • Graphics card (unless youre utilizing the CPUs onboard GPU) and any required 6/8-pin power cables.
  • An individual stick of memory.
  • Your boot drive and its own power connector and data cable.


A CPU AIO watercooler pre-installed.
Bill Roberson/Digital Trends

Installing a CPU is not at all hard, but its always possible somethings gone awry, like the cooler not sitting flush with the processor, or youve forgotten to lessen the retention arm.

If you feel its your CPU thats the issue whenever your PC wont start, consider removing it and reinstalling it from scratch.

Intel CPUs only easily fit into one direction due to a couple of notches at one side of the chip that fit against notches in the socket. In the event that you installed the chip yourself, theres a bit of black plastic that sits in the motherboard slot to safeguard the pins make certain it had been removed before installing the cooling. A frame round the outside the socket holds the chip set up, and a little arm right close to it must be clamped down and tucked within the clip by the end. It requires a fair little bit of pressure to clamp the chip down.

With AMD CPUs, search for a golden triangle using one corner of the chip, and line it up with the triangle on the socket. Once its seated fully in to the socket, carefully lower the arm close to the socket to clamp the chip set up.

An improperly installed processor may also mean bent pins, a damaged cooler, and perhaps a compromised motherboard. Check the encompassing area for damage, like bent pins in the socket or CPU, before reinstalling the chip.

Should you choose see bent pins, thats the likely culprit for the problem. This damage can lead to not merely CPU error codes, but additionally memory error codes, as a bent pin make a difference the way the CPU read and writes from RAM.

Wed caution against attempting to fix this type of problem yourself if you don’t really know very well what youre doing. At this time, plenty of additional research is necessary, or ideally, contact a specialist to assist you.


RAM in motherboard slots.
Bill Roberson/Digital Trends

Memory problems could possibly be the cause of a variety of PC issues. If you believe yours may be causing yours, heres how exactly to check.

Before pulling anything out, ensure that the memory you installed may be the right type for the system. Did you get the proper generation DDR4, DDR5, etc.?

RAM tabs on motherboard.
Bill Roberson/Digital Trends

If you do the right memory, it must be installed in the correct slot or slots, facing the proper direction and fully seated. Check your motherboard documentation for the correct slot configuration. In the event that you bought a dual-channel kit, with two identical sticks of memory, they often have a clear slot between them, nonetheless it varies between Intel and AMD. After determining the correct slots, fall into line the notch on underneath edge of the stick to the plastic riser in the slot. Push down firmly before track of either side of the slot click inwards and grab the notches at each end of the RAM. If the notch is ajar, the RAM isn’t fully installed. Even though it appears like the RAM is properly seated, its smart to remove it and reseat it to ensure you can find no problems.

It is also worth attempting to boot with only a single stick of RAM directly into see if another one may be defective. You can even change the slot you plugged the module(s) into to see if any slots could be damaged and causing your booting issues.

Graphics card

The simplest way to diagnose a graphics card problem would be to make an effort to use a different one. In case you have an extra lying around, take away the original and plug that in instead if the system boots. If it can, your other GPU could be the problem.

In the event that you dont have an extra graphics card, however your PC has onboard graphics, then you can certainly still test thoroughly your graphics card. Uninstall your graphics card and plug your display in to the motherboards display output. If the machine boots, then maybe your graphics card was the issue.

Should you choose think your GPU may be the problem, try plugging it back anyway. Sometimes reseating an element could be all it requires to repair it.

Installing a graphics card into the PCIexpress slot.
Bill Roberson/Digital Trends

Bill Roberson/Digital Trends

Also consider trying different PSU cables because of its power when possible. Its also smart to check it out in another PCIExpress slot on your own motherboard in case you have one. Should you have another GPU, double-check your monitor is plugged straight into the graphics card, not the video port on your own motherboard. If the monitor appears to be the component thats no longer working, try connecting another display to see if that helps. You may even be thinking about our guide on multi-monitor troubleshooting for more technical setups, but generally, its smart to start with just one single screen and add more monitors once everything is running properly.


CPU cooler inside the Asus ProArt PD5 desktop.

Does your personal computer start for a brief period and crash unexpectedly? Does your processor significantly heat up in this trial run? This may be a sign your cooler isnt working since it should. Sometimes coolers could be defective, but its also possible your cooler comes with an installation problem. First, determine when you can hear it: If it doesnt sound or look like the cooler is running at all, make certain the fan is properly connected to the motherboards fan header. The fan header ought to be labeled of all motherboards, causeing this to be a straightforward check, although more difficult coolers may necessitate a few different connections with respect to the design.

If the fan is running properly and fully connected, it may be an issue with utilizing the thermal paste for connecting the cooler to the CPU. The thermal paste is key to enabling heat to flow from the processor to the cooler: Too light an impression when seating the cooler, or the incorrect sort of paste for the work, as well as your cooler wont have the ability to siphon off heat properly. In the event that you suspect thats the issue, your best option would be to reseat your cooler, and the earlier you do that, the higher, as you dont want your processor to overheat again.

Detach the cooler, remove any items of dried thermal paste which may be in the manner (99% isopropyl alcohol is actually ideal for this), and reseat the cooler with a fresh dot of thermal paste in the guts. Then seat the cooler carefully along with the processor, and tighten any brackets or screws partially, sequentially, so you dont overload anybody side of the coolers mounting and put undue pressure on any particular area of the processor. Remember, you dont need much thermal paste, and the paste shouldn’t squeeze or go out the sides if you are seating.

Collateral damage

When everything else fails, check every component on the board for physical damage. It could not be immediately obvious that something is wrong, so check thoroughly for whatever looks unusual, as well as bent or damaged heatsinks and PCBs.

Another danger you face when creating a computer is static electricity. Unfortunately, parts which have been damaged because of exposure wont necessarily show any physical signs. If for reasons uknown you suspect static buildup is in charge of an element failing, youll need to replace it with one which works to verify thats the problem.

The machine begins on top of that, but fails

If the machine is successfully turning on, and a sign appears on the screen, nonetheless it doesnt reach the specific operating-system before shutting down, the set of possible problems will be a lot shorter.

First, well check the hard disks physical connections. Whether its an SSD or mechanical drive, it needs two connections, one for power, and something for data. The energy cable should run from the energy supply to the drive, but there might be other similar connections on a single cable for multiple drives.

SATA may be the hottest data connection in the event that you own a comparatively modern computer system. SATA is really a small, thin plug having an L-shaped bend in the end, that may run from the drive to a row of plugs on the motherboard.

Attaching front panel USB connectors to a motherboard.

The motherboard manual will specify which plug is which, with different speeds and capabilities between the options. Check the motherboard for markings to recognize the plug quicker if you want to save time. If your motherboard has any extra settings options, like RAM optimization modes for gaming, make certain theyre shut down for the present time youll desire to avoid any overclocking that may be shutting down your personal computer before it could get properly started. When you have everything ready to go well, it is possible to begin working on overclocking strategies if you like.

Often, resetting the CMOS is all you should fix your PCs posting and booting problems. Utilize the motherboards reset button. If it doesnt have one, youll need to take away the battery.

If the OS logo stays on screen as the PC is rebooting, there might be an installment issue. You can test booting to safe mode on a Windows program. In the event that you recently switched to Windows 11, the brand new operating system could be putting more pressure on your own hardware, that may cause boot failures on older equipment. Ensure that your PC can run Windows 11, or anticipate to switch back again to Windows 10 if necessary.

If everything else fails, try resetting Windows to check out our helpful guide on how best to restore Windows to its original settings.

Theres no sound


Always begin by checking manual volume settings and making certain your sound isn’t turned low or muted this may happen unintentionally when youre focusing on your personal computer.

If you work with external speakers, unplug them and see if your monitors built-in speakers are functioning (should they keep these things). If they’re, turn your personal computer off, plug the external speakers back, then turn the computer on again. It’s also advisable to visit your Sound Control Panel in Windows 10/11, head to Playback, and make certain the proper speakers are set as Default.

Its also possible that something has happened to your speaker drivers. You can examine with this by looking for Device Manager, and locating your speakers or sound card. Right-click in it, and elect to seek out and update drivers.

You may even desire to try updating the BIOS in case you are running a mature system and nothing else is working.

Bluetooth isnt working

Mark Coppock/Digital Trends

If devices arent connecting via Bluetooth, begin by ensuring it is fired up. You could find Bluetooth manually by visiting Settings, then Devices, then Bluetooth & Other Devices. If Bluetooth is off, transform it on. If its on, transform it off for a couple seconds, then transform it back on. If your personal computer has recently paired with a Bluetooth device, remove that device now and try adding it again to see if it’ll work.

Its also smart to be sure your Bluetooth device is fully charged and fired up, particularly if you dont view it as a pairing option. If youre on a laptop, be sure the Airplane Mode isnt enabled.

If your Bluetooth doesnt look like functioning at all, it is possible to head to Settings> System> Troubleshoot, and discover the Bluetooth troubleshooter. Run it, also it should fix problems like drivers that havent been updated, etc.

If there is nothing working, it is possible to return to Device Manager, find your Bluetooth, and right-click to select Uninstall Device. Reboot your personal computer afterward, also it should automatically re-install Bluetooth so that you can check it again.

The PC takes too much time on top of that

Fast Startup option in Windows.

Sometimes your personal computer may successfully boot, nonetheless it will take way too long. Should this happen repeatedly, there are many things you can test to fix the problem.

First, make certain Fast Startup is disabled. This feature is normally enabled automatically, but will often cause problems once the PC is booting. You could find it by visiting Settings, System, then Power & Sleep. Here choose Additional Power Settings, and in the brand new window, select Choose What the energy Buttons Do. Now select Change Settings WHICH ARE Currently Unavailable (youll need administrator credentials because of this). Disable Start Fast Startup, and choose Save Changes to complete.

Sometimes problems with your GPU may also cause lengthy boot times. You can travel to Device Manager and check out Display Adapters to get your graphics card, then elect to Update Driver to see if this improves things.

If youve been experimenting with Linux in Windows, you will need to try turning off your Linux shell to see if this solves booting problems. Seek out Windows Features, and make certain the Windows Subsystem for Linux is switched off.

Connected peripherals arent functioning or detected

Begin by checking that peripherals are properly connected and functional. When you can, hook them up to different computer and see should they work there.

If the hardware all is apparently working correctly, its time and energy to check out the drivers again. Head to Device Manager, and discover the peripherals that arent working. Right-click and pick the Uninstall substitute for remove their drivers. Reboot your personal computer and await it to set up the drivers again. This may often fix problems with peripherals not being detected or working.

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