Issue #1: This is on my iMac. Should I be concerned about the video card? Issue #2: Since ownership, it's also been shutting down randomly, which is another issue. The only thing I've upgraded is the memory from 2GB to 4GB. I've ran the Leopard full memory test and it ran without a problem. Even if it was faulty memory, doesn't it just generally lock up or restart the computer? I've been reading around and people with similar issues said it's a faulty power supply within the iMac. I've moved the computer to various wall outlets and even have a UPS attached to isolate the problem. Even with all these things, it still shuts down randomly. Like once every 1-2 days. It's REALLY random. Any suggestions or thoughts?