The switch might cause even more problems as you'll now be giving the power supplies a serious undervoltage condition! Probably wouldn't release magic smoke, but....
Just for sake of discussion, did you check that the computer's receptacles are wired correctly, that the neutral isn't open or reading high (say about 10-15 volts or more) referenced to ground? Recepts don't have hot/neut reversed?
Any possibility of heavy harmonics on the neutral? (Lots of computers in use or electronic fl-lamp ballasts sharing the same panel/transformer.)
It might be worthwhile in this case to buy/rent a power quality analyzer to figure this one out.
Good luck!
