Hi everyone, I just got my new single 1.8GHz PowerMac, and I've having some problems. About once per day, I come back to my computer and it seems to be locked up. I can move the mouse around, but nothing responds to clicks, nor the keyboard. I bought 1GB of RAM (not from Apple) that I've been using since I got the machine. When I first booted it, I ran the Apple hardware test (the shorter one) and it said everything was okay. So I tend to think it's not the RAM (which seems to usually cause this kind of problem). Are there any other tests I should run? Does anyone suggest anything? Thanks.