Need help: Step by step approach in the restoration of old computers

My procedure (for which I've been flamed here, I might add) is as follows : 1) Dismantle the machine as far as is sensible. Do a visual inspection for a) Loose phardware that might be causing short-crcuits b) Bent pins, etc that might be doing the same c) Broekn/burnt compoennts 2) Check that mechanical parts, including fans, are free to move correctly 3) Check for ovious shorts on power lines if possible. Maybe remove large cpaacitors and check them separately using a bench supply and series limiting resistor. 4) Check earth (ground) wiring back to the mains plug. Preferably at test current of twice the mains fuse rating. You don't want this wiring to burn out if there is an insulation breakdown, having the chassis becoming live is not good for the machine or anything it's connected to! 5) Do an insulation test (1000V test voltage) on the mains-connected parts (trnasformers, fans, etc) To be fair, I've never had a piece of _old_ computer hardware fail either of those tests. New stuff is another matter! 6) At this point, power up as little as possible. Maybe just the transformer and fans. Check the output voltages from the transformer, leave it on for a bit and see if anything gets hot (may indicate shorted turns in the transofrmer). If you are worried about possile peoblems here, connect a mains-rated light bulu (100W or so rathing) in series with the supply to the machiune. With just the transformer and fans running, the bulb might give a dim glow, but nothing more. If it glows brightly, you've got a short somewhree. 7) Add the rest of the PSU. Check the output voltages on dummy load. 8) Add as little of the logic as possible to get something that will work. Check again. 9) Add some more logic, checking at each stage. -tony