Things to do: Check cable/input for bent pins. If you are using a standalone video card make sure it is seated in slot. Try a different monitor. If all of these fail the guess would be onboard video failure (if you are using onboard video) or failure of video card..in which case, install or replace slot card.
Hi, so basically it was all working one day the next day the computer was moved to a different room and it turns on still and the monitor is getting power but it says no signal detected. Ive made sure the cord connecting the monitor and PC was plugged in properly because that has fixed it before but no luck this time, please help thanks.