Monitor help?!?!

[dan17]

I have an old PC (running XP) and my monitor just died, so I borrowed a friends monitor (who's running Vista). I hooked up this monitor to my PC and then had to reformat my hard drive (not because of the monitor, but because I had been meaning to do that anyway). Everything worked fine. But now when I gave my friend her monitor back, her Vista PC doesn't seem to recognize it. I hooked it back up, and a box comes up that says "VGA: No Input Signal". I tried reconnecting it several times, rebooting, etc., but nothing seems to be working. Any ideas?

[Hitman22]

You should check if the connection of the cable is plugged in . See if the Video card is plugged in properly, just eramove your video card and put it back properly

[kiLLer]

Have you tried the second monitor and if it works then there is problem with the UPS? Have you carefully checked the cable from your graphic card to the monitor?