Worked one day after replacing power unit

wont start up replaced power supply with rebuilt unit worked for one day froze.Now will not start up

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Open it up and check the capacitors for swelling and/or corrosion. Check the LED lights on start up and let us know the results and we can proceed.

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Don't know if will help but the one I'm working on wouldn't start last night . . .

I opened it up and hit the internal start button earlier today and now it does start up . . .

Found the description here:

http://support.apple.com/kb/HT2173

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Karen will be eternally grateful.
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