Chosen Solution
My computer (Apple iMac “Core 2 Duo” 2.0 20-Inch (Al) Specs Identifiers: Mid-2007 - MA876LL - iMac7,1 - A1224 - 2133) is completely dead. The power button does nothing… no fans or anything. I opened up the computer and zero LEDs are lit. I’ve checked out this document: http://www.scribd.com/doc/47791656/Apple… I’ve worked through the suggestions. I thought it was the power supply and bought a new one from dvwarehouse. I replaced it and that changed nothing. Still no LEDs. Does this mean my logic board is fried? If it was fried, wouldn’t one of the LEDs still be lit? The last thing the document suggests is “If the issue persists, replace the AC line filter” But that is the only reference to a line filter I could find anywhere. What is it and how do I fix it?
Usually you get at least one green light even with a blown power supply. Use a multimeter to test that you are getting power to the wall plug and the power cord. Keep using the multimeter and trace out where you are loosing power. Look for fried or burned wires. Remember that you probably have a short in one of these wires and the frame may be hot (electrically charged) to avoided getting shocked.
So far on 2 iMac’s the problem has been the hard drive. It never would have been something I would have guessed, but someone recommended that I unplug it and the problem was solved. I guess something was internally shorted out in the hard drive. As soon as I unplugged the drive, then plugged the computer back into the wall it would turn on. Originally I had thought it was the power supply but after replacing that and having no success I was looking for other options.
