Computer locks up -have to do hard shut down- after about two times its ok

Seems like the computer locks up on battery or AC. When I shut down with the power button two or three times things seem to work ok for a while. I bought this about two weeks ago and the seller stated that g4's have a problem with processor location that can make computer act up. could this be the problem.

Welcome to Apple Discussions!
When you say the computer locks up, do you mean it freezes and you have to force shut it down? This is not considered normal behavior. It could indicate logic board problems. What the seller told you sounds like BS to me. You might want to consider returning this one and looking for a different one. Even if the problem is intermittent now, it likely will get worse over time. And could be expensive to fix.
Good luck!

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