In order to test a PSU properly you also need to switch the loads from say 25% to 100% load at differing frequencies to measure the dynamic change in output voltage. If there is an unacceptable voltage change - more than several 10s of mV off the top of my head - this indicates that the smoothing cap. is o/c or close to it. PSUs can also overvoltage with load changes, but appear to output the correct voltage on no and steady loads.
For professional, and expensive, computer repair there is a repair shop on the east side of Barbados St. somewhat Sth. of Tuam St. Sorry I forget the name. For a more 'homely' service I can recommend Graham Vincent who runs Vintron Electronics Ltd 142a Yaldhurst Rd Avonhead Christchurch 0-3-348 8454 -- Sincerely etc. Christopher Sawtell
