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1.83 GHz Core Duo or 1.83, 2, or 2.16 GHz Core 2 Duo A1208 (EMC 2104/2110/2114/2124)

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iMac won't power up - likely diagnosis?

I have a 2006 iMac intel 17" (model 1173). My daughter unplugged it while on a while back and it has refused to turn on ever since - no noises, no grey screen, nothing. If it is plugged in and I put my ear to it, there is a faint and somewhat erratic "ting" sound. I can't hear anything when I press the power switch. I have tried to no avail

  • a different AC cord
  • reseating the ram

It seems likely that the power supply is the culprit, but are there other possibilities to consider before I spend the money on a new supply? Is there a way to test the PSU without opening the unit up (doubtful, I know)

Update - I followed the instructions in the power supply replacement section, and disassembled the imac. In the process I tried powering it up to see if any LEDs on the logic board lit up. None did. I removed the power supply and tested it - it's output was a little over 7 volts - way under spec. So I'm assuming this is the culprit, although it's possible that when it failed, it took something else down with it.

One other note - my particular model is a 2104, which has a different power supply than the one in the instructions for 17" intel iMacs, which I think uses a 2114. The 2104 has a smaller PSU plus a separate DC-DC converter board. The 2114 has both parts on a single board.

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Update - I ordered a new PSU from iFixit, and am now happily posting this on my repaired iMac. The reassembly was pretty simple.

I should note that the new iFixit PSU is quite nice - it appears to be of higher quality than the original Apple PSU.


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Match the right power supply - YES they do have different ones, you don't want to run the wrong one, you'll only make more problems for yourself if you do.

If this answer was helpful please remember to mark it accepted.''

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I think you have the 2124 not the 2114. To get you to the correct part, please give us the last three figures of your serial number.

Here's how to replace the power supply: iMac Intel 17" Power Supply Replacement

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Doug sera éternellement reconnaissant.
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