|Two weeks ago, the display went black on the computer. This computer is used as the media server in our home network, so it's always on and connected to the HDTV. Anyway, I didn't have time to troubleshoot the issue back then, so I just turned it off.|
Last night, after the computer being turned off for two weeks, I finally had some time. Surprisingly, the display came on just fine. However, about 10 minutes the screen went black... except for a horizontal line across the bottom of the screen that consisted of columns of small red vertical lines. Then after about 3-5 minutes, the hard drive light on the front of the machine stopped blinking and went out. After rebooting, the display never came back on. The TV says there's no signal. The machine started beeping slowly, although I'm not sure if that was because I had to hold the power button down for 10 seconds to turn it off.
This desktop has nVidia GeForce 9100 integrated graphics on-board. It's connected via DVI to my HDTV.
A little history...
Before we got the HDTV, we needed this computer to connect via S-video to an older television that we were using as a second display. In order to do that, I had purchased and installed an nVidia GeForce 9500 GT card because it had two DVI ports and an S-Video port. That setup worked fine. When we got the HDTV, I removed the GeForce 9500 card and went back to using the on-board graphics card... connecting it via the DVI port to the HDTV. That setup worked perfectly... until two weeks ago.
So this morning, thinking the problem was due to the on-board graphics card, I figured I'd test the machine with the GeForce 9500 GT that used to be in there. I inserted the card in the same PCI-E slot it used to be in, connected the HDTV to the DVI port on the card and booted. Same thing. No display.
I didn't reload drivers, check the BIOS or change settings because 1.) without a display, how can I see what I'm doing? and 2.) I never removed the drivers or changed settings when I went back to the on-board graphics six months ago - the computer, at that time, simply recognized I was no longer using the PCI-E card.
There's nothing wrong with the TV, because it works fine under all the other source modes (i.e. television, DVD player, etc.)
Is it possible this isn't a graphics/video card issue, since the display doesn't work with either on-board graphics or the PCI-E graphics card? Am I overlooking something? What could be the problem?
Oh, and I also tried booting via my System Repair disk, but that didn't work either.