Hello, a buddy of mine gave me his old iMac G4 800mhz yesterday. I wiped it and installed osx 10.4 and it ran pretty well, but as soon as I upgraded to 10.4.11 it started hardlocking after a few minutes of use. I thought maybe it was heat, so I cleaned it out and put new thermal paste on. Same thing's still happening though. It didn't happen at all in 10.1 or 10.4, only in 10.4.11. Any idea why it'd be doing this? I've never even touched a Mac before, so I'm completely lost as to how to troubleshoot this issue. Any help is appreciated, thanks!