This quick video tutorial will show you how to fix a computer that has no power. If your computer won't power up, follow these steps: Check the back of the computer to make sure the power cord is plugged in, and check the other end of the cable to make sure it's plugged into your power strip, and that the power strip is turned on. Try plugging your computer directly into the wall. Check the switch at the back of your computer to see if it is in the 'off' position. Unplug the power cord. Hold in your power button for about 15 seconds and release. This discharges any built in capacitors on your motherboard. Plug the cord back in and restart the computer. This works about 90% of the time.