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paid a whole $10 for the imac
was surprised when it lit up and had a good screen with readable text
think I powered it on or off 3 or 4 times to the same screen grey error text
wait a few days tryed again now dead no lit no sounds fan beep ECT
so took it to apple still dead after several tricks by them
so took it home to open up
and began a web search on power supply for apple info
very little on how they work or repairing one R&R is standard only
fine BUT then I maybe back to a bad M/B for more expense
so first trying simple cheap tests like check volts with A VOM
tryed that at both PS end and at m/b power in but no pinout at ether end
for my exact box and I have not yet pulled the M/B so testing the back side pins
and can't even see wire colors to guess at what should be what
based on a numbered imac 27'' pinout of some pins at the M/B is all I have to go by
still searching but apple split the power connector on the 21.5 into two connectors in separate
locations on the M/B
while the 27 is all 14 pins on one I hope matching the 14 pins numbered on the 21.5 power supply
next idea is try to use a pc P/S that I have to feed power to the imac to see if it works
but I need better info before I try that
no real need of a imac or real desire after seeing how little info and high priced parts
and higher fail rates too to invest much ether
rather just buy and install a new M/b i7 and memory in a normal PC desktop
something I can do likely for about the same cost as this old imac would cost for the old parts
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