Random issues lean more toward disc errors that hardware.

You can eliminate the mother board by using a hair dryer and blow hot air on different sections of the mother board.

Electronic problems are linked to heat issues. Heat a component and it will begin to fail.

I would start with a good check or your RAM. Remember, the computer loads most of what it needs in RAM. If you are having random issues, your sequence of likely culprits should be RAM, hard disc and mother board (or disc controller).

John Stewart
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