PC Won’t Turn On But Motherboard Light Is On?

Indeed, it is really heartbreaking to see that your PC isn’t turning on even while the motherboard is on. You aren’t sure where to start! Yeah, this happens and if you too are going through the same phase at this moment, here’s how you should be fixing it! It may either happen due to the malfunction of the main power supply, or maybe because you had a bad motherboard. It may even happen because you had an improper memory system or an insufficient voltage supply!

Steps to fix your PC when it isn’t turning on even when the motherboard light is on

You may find that even while your motherboard is on, your PC seems to be dead. It may occur due to several hardware configurations, or because of the low PSU. Well, if you want to trace the actual reason behind it, here’s how things are:

  • Check the cables

This is the first and foremost thing that you must check when you see that your PC isn’t switching on even while the green light on your motherboard is active.

  1. Simply plug in a device to check that the wall outlet is active. You can even check it with the help of a lamp or maybe give it a try with your mobile charger.
  2. Next, ensure that the power strip or the surge protector is correctly plugged into the outlet. You may cross-check it with the help of some other device by connecting it to the power strip.
  3. Now check that the power supply on/off switch of your PC is on.
  4. Lastly, confirm that the power cable is plugged in correctly. It may get loose over time, so just check if things are placed right.

If all the aforementioned steps went fine, just double-check the connections of your PC by testing the PC power cable which plugs into your PSU. You can even swap out the monitor cable with that of the one that fits your PC and check if the monitor is turning on. Also, check it with a replacement C13 cable in case you do not have any spares.

  • Check the internal wiring

Once you have checked the exterior of your PC, it’s now time to verify if there is no loose or malfunctioning cable inside the case. However, it is always recommended to connect with your system manufacturer once prior to opening your PC as it may violate the warranty contract otherwise!

Now, you should start unplugging the cables and disconnect all the external peripherals that are connected to your PC. Remember that the display connection cables or the USB devices may lead to power issues. Also, you may try finding out the trouble by plugging each cable separately while your PC boots on, and thus, think of identifying the problematic peripheral.

If at all, you are planning to open the case and have an access to the internal components of your PC, you may refer to the documentation to check if any of them is loose, and then reset it all over again. Double check the seating of the cables on your modular PSU, in case you are using one!

  • POST codes, and hardware tests

Even when you have pressed the power button on your case, you see that the system isn’t running! This is when you should be following the steps below:

  • POST and Beep Codes

Conducting built-in tests may help you identify why your PC is failing to boot! Power On Self Test or POST codes and beep codes are visual and audio cues that your motherboard manufacturer would use to send signals related to the internal hardware tests. You will have to start troubleshooting your RAM if you see there is a memory Initialisation error. If you have a motherboard that offers a hexadecimal display, you can easily identify where to start the diagnostic process from! If there is no built-in display, you may get a POST test by getting it installed into the PCIe slot and displaying the code before you.

On the other hand, the beep codes are the auditory equivalent of the POST codes. You get to hear a series of beeps while turning on the power of your PC. Different manufacturers used a different system of codes, and you can check the motherboard manual to find out what went wrong!

  • Test the components of your PC

If you see that your PC hasn’t started yet, you might need to start testing each and every component of your system individually. It is quite similar to that of checking the power cables, and this time, we shall check if the connections to the motherboard are fine. Ensure that all the hardware components are properly connected to your system.

Start this process by removing the GPU, and disconnecting the storage while unplugging all the devices from your I/O.

Just keep one stick of your RAM connected to the motherboard, and try checking it out! Keep on continuing this process till the time your system starts booting appropriately. This will help you identify where the issue is!

Once you have found out that your PC has started to POST with every other component plugged in, except the faulty hardware, it’s time for you to either troubleshoot the hardware or think of going for its upgradation.

Frequently asked questions

Will my PC turn on even if I have a bad motherboard?

You can’t think of starting your PC without a motherboard. It is an integral part of the system that runs it, and thus, your PC won’t run if the motherboard you own isn’t working!

How to identify that you have got a faulty motherboard?

You will start finding that your PC isn’t getting on even after several attempts. It may also crash at times! Also, it can happen due to a bad power supply. In certain cases, you may find that the power supply is fine, but the system isn’t turning on due to a faulty motherboard.

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