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I have been having problems with my 15" 1 GHz Powerbook. It started when I upgraded my RAM with a new chip. As soon I put in the new RAM, the machine became unstable and crashed after about five minutes. It had been working fine before. After going to Apple store and having it tested, they determined the logic board needed to be replaced.
I had the logic board replaced by Apple, but it still has the same problem, although it doesn't freeze as often. They reinstalled OS X so I had a fresh install. One thing was that after the repair I checked the harddrive and found a error on it. I repaired it from the boot CD and it is verified, but I still have the freezing.
Could the harddisk being damaged lead to a bad install of OS X? And if it's not the logic board, what else could it be?

Thanks, Ian
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