Try the common one like BAD CAPS at google.com so you can get some pictures of the issue. Now inspect your machine.
My computer runs fine until suddenly no video. System powers on but no video.Everything is on board, so i installed a video card but the result is still the same. I am lost.
System info is: Dell Optiplex GX270, XP-PRO, 512MB,40Ghd, 1.5ghz