Effect of COLD

For anything I've not used for some time (or at all), I will 0) Pull the case and check for loose parts that are waiting to cause shorts, etc 1) Do an insulation test between both mains wires and the case, using a 1000V tester 2) Do an earth continuity test, passing at least 10A through the earth wire 3) Check known failure points that can cause real damage (shorted pass transistors in linear PSUs (or, indeed, some switch-mode regulators, like the ones in some HP desktop calculators) 4) And _still_ run the PSU into a dummy load first... It seems to be sensible to spend some time checking the above to prevent much larger problems later. Either damage to me (if the casing becomes live), or more importantly to a classic computer -tony