Gave my old pc to my mom a while back, everything was in working order but for some reason it won't boot anymore. It all seems to be working, all the lights on the motherboard light up, the fans are running and the dvd drive has power, but the monitor says its getting no signal. I tried changing monitors and that didn't work, tried removing the memory one stick at a time and no change. Could really use some suggestions on what to try to get it going again.