I picked up a 7200/120 PowerMac a little while ago for a ridiculously low price on clearance. anyways, I got it home, set it up and was disappointed to find that it constantly froze after about 5-10 minutes of use. I searched the net for help and found this question from Experts Exchange:
I have a 7200/120 that kept on freezing every 5 minutes or so, and I
couldn't figure why. I zapped the PRAM, ran the hard disk through the
wringer, did a super clean install of the system, got all the patches.....
still, no matter what it would freeze up after five minutes every time....
Then all of a sudden, it's not happening anymore.... the only thing I have
noticed is that the weather is much cooler now...could this be the
I hope not, since it didn't really go over 90 degrees, which isn't so hot.
I remember running my 660AV in Australia and I know for a fact it was close to 90 degrees
almost all summer, and even got to 113 degrees...
Like this gentleman, I've tried everything: Zapped the PRAM, removed the cache, tried a new hard disk, tried a new CD-ROM drive, tried a new keyboard/mouse and even a new SCSI cable. The only thing I haven't tried is new RAM as I don't have a new chip (but I will try that shortly)
The accepted answer to this problem was overheating, but the fan is working fine and the heatsink on the processor is not even warm to the touch. The problem however is intermittent enough that it does seem like a hardware problem.