I've just taken a couple of old PCs from my parents' house and begun to upgrade them. There are video problems with both, but I'll just give you one problem for now and come onto the other later! Basically one of the machines I want to be able to use for projection, so I purchased an additional video card. It's a fairly old machine, so it only has PCI slots. I purchased an ATI Rage 128VR from Amazon for £17 (not allowed to post a link yet, this being my first post). The original video card is separate, not on-board. The problem is, XP starts up and begins to install the new video card (I see the balloon pop up in the bottom right hand corner) but about 30 seconds later the screen goes blank and doesn't come back on (that is, "No Input Signal" appears on the monitor and it switches off). This is an LCD screen plugged into the OLD video card. There is currently nothing plugged into the new one. In addition, nothing appears on the screen until the Windows welcome screen appears. So no BIOS on-screen. I also installed new memory at the same time, but wouldn't have thought that would be the problem.