Well, last night I finally received an ibook 700 G3(os x 10.3) purchased on ebay. I got it home, booted it up and the ibook all seems to work fine, for the first 5 to 10 minutes that it's running. Then, the system just stops responding. None of the icons or 'windows' will work, no keyboard response either. Only a cold shutdown will work. Once rebooted, all works fine, but again after 5 to 10 minutes, the system just ceases to respond. I thought maybe the Power Management settings were the cause, so I set everything to "never" for sleep, hibernate, etc. That didn't make any difference. I don't know if there is any kind of hardware issue, or strictly software related. On the way to work this afternoon it occurred to me to try booting to the old OS 9.** kernel, which I noticed was present. Any thoughts?