Two days ago, one of our computers went on the blink. After about a minute, it would totally stop responding or even sending a picture to the monitor. It stopped doing this when we replaced the memory. Problem fixed, or so we thought. This morning the same problem has popped up. I'm thinking that there's something in the computer--perhaps a bad power supply, as that killed my home computer once--that may be causing the memory to go bad. Or maybe it's something else. Any ideas?