|Does your computer completely shut off after a second? Or does it remain on and your monitor says 'No Signal'?|
If your computer stays on but your monitor says 'No Signal', make sure your monitor cable is properly secured to your computer and that none of the pins inside are bent.
If your computer completely shuts off, try switching directly to a wall outlet instead of a powerstrip.
IF this does not work, you most likely have a faulty or shorted out PSU (power supply unit).