There are a variety of reasons why your computer may not be starting up. It could be something simple like an incorrect BIOS setting, or something more serious like a failing power supply, motherboard, or other component.
In order to find out what’s causing the issue with your computer, you will need to conduct some investigations. Below are some helpful tips that you can use to narrow down the problem and possibly fix it.
1. Check your power cables and make sure they are properly plugged in. Also, check the wall outlet and make sure it is working correctly.
2. If the power appears to be working correctly, check the internal components. Open up the case and make sure all the cables and connectors look good. Look for signs of burning, discoloration, leaking, or other physical damages.
3. Disconnect any external devices such as printers, monitors, USB drives etc. from your computer and try to start it up again. This will help you determine if the problem is coming from outside your computer.
4. Take out the memory (RAM) modules one by one and try to start the computer with each module separately. Replace the RAM modules with known good ones if possible.
5. Check the BIOS settings and make sure they are correct. Make sure the date and time are correct, the boot order is correct, and the hard drive is selected as the boot device.
6. Reseat the processor (CPU) in its socket. Make sure the processor fan is connected and functioning properly.
7. Check the video card, if you have one installed. Make sure the video cable is fully inserted into its slot and the fan on the card is working.
8. Unplug your power supply and check its voltage ratings. Make sure they meet the requirements of your components. If the power supply is below the requirements, replace it with a compatible power supply.
9. Try booting your computer in “Safe Mode”, this will allow you to access the computer and troubleshoot the problem.
10. If all else fails, consider taking it to a professional computer repair shop.
If the above tips do not resolve the issue, then it is likely there is a problem with one of the internal components. In this case, it is best to bring your computer to a professional technician who can diagnose the problem and suggest an appropriate course of action.