On Nov 11, 2005, at 3:33 PM, Charles Martin wrote: > At a wild guess, I'd say you left the programs running too long and > they overheated your machine (since they don't allow the Mac to > sleep). (Matching Charles' tone.) This is of course nonsense. A properly designed computer should be able to run flat out day in and day out without problems and I dare say that in general Macs are some of the better designed computers that you can buy. I personally run folding at home on numerous Macs and PCs - all with sleep disabled. This means that the CPU is pegged at 100% 24 hours a day. I've never had a problem doing this. It's far more likely that Brian just happened to tickle a bug in the graphics driver and/or kernel. Phil