I am trying to help a teacher with a PowerMac 7300 that just died on her. When I got to it, it wouldn't see the hard drive. So I formatted and loaded 8.5 on it. As soon as it booted, it crashed with a message that said that quicktime had performed an illegal execution. Then I turned off all extentions and it booted all the way. Now everything crashes when you run them, web browser, sherlock, help. even the finder crashes. Could a bad battery do this or is something more seriuos wrong?