The typical thing that goes wrong with computers from the 80's and 90's is the electrolytic capacitors dry out and go bad. This got even worse with the "capaci

The typical thing that goes wrong with computers from the 80's and 90's is the electrolytic capacitors dry out and go bad. This got even worse with the "capacitor plague" of the late 90's/2000's. I would guess the PDP-11 has fewer capacitors or of a different design.