plus (if true), the late 70s were the dawn of aluminum wiring, and they didn't figure out that the load-handling abilities required different gauges of aluminum vs copper wire, it was known to cause all sorts of strangeness.

Just as a check-off on the list of sypmptoms, you might give the fan in the case a shpritz of air; sometimes the dust will accumulate and act as a blanket, which can make the laptop feel hotter. Just a thought...

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)