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After leaving unplugged for awhile, I can turn the power on, but only the fans will run for a few seconds. After this nothing will happen after the power button is pressed. Is this the sign of a bad power supply? If not, how can I further diagnosis it?
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Try an SMC reset - unplugging it killed the backup battery... when that happens strange behavior can result.
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Thanks for the info, but it didn't work.
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I ended up replacing the power supply. I got the part and most of the tools from here and it fixed my problem. Thanks a bunch iFixit!
by Kyle Evans
Kyle, Congrats! Take the credit of answering your own question. Please remember to mark your question as solved.
by Dan
Where do I mark it as solved?
by Kyle Evans