When I turn on the switches and press the button on the cabinet to turn my computer on, I can hear the fans turning on, but my monitor displays "No Signal Detected !" And then turns off. My monitor is BenQ GW2255. When I was playing a game on my PC, I accidentally touched it with my feet and it moved across a few centimeters ( I didn't kick it) and that's when the PC shut down. Since then it isn't booting up. Please help me, this has happened before but automatically solved itself too!