I'm working with a new dual G5, currently on OS 10.2, and it has been acting rather strangely. Three times in the last week I have left the room for a few minutes while it's been on (having only been on for 20-30 minutes prior), and I come back to find it in an odd cycle. The fan is whirring on high, then it makes a clicking sound, as if it is turning itself off. The monitor goes off, and the fan stops--but within a few seconds, it has clicked back on, turned the monitor on, and the applications still appear where they were before the 'episode'. This repeats again and again until I shut the whole thing off. I'm not sure whether the computer is actually turning itself off, since the applications haven't closed when it comes on again. Someone suggested that Panther might fix this glitch (and I have it on order), but I'm wondering whether this may be a hardware problem. Any ideas? Thanks!