Here is a weird one that's got me stumped. My parents computer had developed a weir issue. The graphics output doesn't work. I swapped the graphics card and still no fix. Not even the bios splash screen appears. The thing is that the computer actually boots up. You can hear the vista jingle. Monitor and cables are fine. Everything in the computer plugged and working. Took out the cmos battery and tested the ram in another machine. The computer is a HP pavilion s3040. 2 gig of ram. 160 gig hard drive.