I bought a used G4, and have recently started to have major problems. I have not made any major hardware changes, so I'm not sure what is going on. My Mac just started to freeze after my Mother-In-Law came over... It makes my Mac look bad with XP is more reliable than Panther. It seems to Freeze randomly.. and freeze up hard requiring I hit the reset button to reboot. No error messages, and nothing shows up in my logs (I think). It seems to freeze most reliably (most often) when affecting the UI. Meaning that I can usually get a freeze if I play a DVD and then move my Safari Window around in front of it. I have done everything I can do to think.. and I'm running out of ideas. Let me know if you can think of anything, or if you think I might have screwed up anything. I Repaired Permissions First. Ran TechTools Pro Ran DiskWarrior I Zapped the PRAM. I Reset the Firmware. I Reset the PMU. I Tried a Different Mouse. I Tried it without my Keyboard. I Tested my RAM for 24hrs with MemTest86 in a PC I Installed Panther on a different drive. I Tried a different IDE cable and different power. Does anybody have an idea.. or has some suggestions what might be the problem?