Clean the computer. remove dust. reseat the memory, cards, and cables.
see that the fans are working. if lots of hardware has been added to the machine over the years, the power supply may not supply enough current.
about dust. the pins on ICs can be very close together. "dust" may bridge adjacent pins. I use a paint brush and a hose vacumn cleaner to remove dust. I have not static zapped anything yet in over twenty years :-) Some PC cards that had dust and cigarette tars I have cleaned with dish soap and water. They get real clean and shiny. This has fixed a few boards that were dead. A few modems and soundcards.
good luck.
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