How to Power On Desktop Computer – Self PC Troubleshooting
1. Trust me it or not, the number one reason why a computer won’t turn on is because it wasn’t turned on!
- Check Power button/switch on the front of the computer
- Check Power switch on the back of the computer
- Check Power switch on the power strip, surge protector, or UPS (if you have one)
A faulty or bad power cable is not a common cause of a computer not receiving power but it does happen and is very easy to test for. You can use that one that’s powering your monitor (as long as it seems to be getting power), check one from another computer, or a new one.
Replace your power supply if it fails your testing or you experience the symptoms I just described.
Tip: Some motherboards have tiny power buttons built in to the boards themselves, providing an easier way to test the case’s power button. If your motherboard has this, and it works to power on your computer, replace the case power button.
Note: I highly recommend that you test your computer with a Power On Self Test card to confirm that the motherboard is the cause of your computer not turning on at all.