I don't know if my video card is going bad, or what I should be looking at. I have a Mac Pro 3.0 ghz (one of the originals) with an ATI Radion 1900 video card. In recent weeks, two applications have been giving me odd stray lines across the window (Fusion and Safari Beta 4). The lines show up in a screen capture. Today, I've been using Motion 2, and twice the machine completely froze up, and then later the video completely disappeared. The machine is hooked up to two monitors, and both of them went dark. In all cases, I have to force-off the machine to turn it back on. My Northbride temp is showing 165 F. I don't know what else is relevant. I can't read the temp of the video card. Any ideas?