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Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Will not turn on

Hi my imac worked perfectly for 6 years, went to switch on yesterday and nothing at all, no lights or noise. I can hear a clicking sound from the rear !!


Beantwortet! View the answer Ich habe das gleiche Problem

Ist dies eine gute Frage?

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Please give us the last three figures of your serial number (located on the bottom of your stand). This will allow us to get to to the correct repair guide. The machine you selected is a 2008 model and you've stated you have an older machine. Thanks


Hi Jerry

Thank you for your response, i actually have a Imac EMC 2105. Could the error be thrown up by the inverter ?



Not unless Apple hard-wired the system's functions to the backlight control. That's all the inverter does. If that goes out, all that happens is you can't see the screen, but it technically still works. This is not your problem. (It may well be fried, but that's not what's causing your problem. I still suggest checking the power supply.)


Jerry - diagnostic LEDS?


Ok, here's a link to another post that's very similar. This might give you a place to start, at least. Courtesy mayer after a Google search. (This site comes up a lot there. :p ) iMac - no power, number 1 diagnostic LED on


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Gewählte Lösung

It could be a couple different things, but my first thought is a failed power supply. It could be shorted out due to a component failure, which would certainly prevent any other components from starting up and could cause a clicking sound.

Check the power supply itself using the guide here.

While following the steps to get at it, keep an eye out for any other signs of damage or problems (discoloration of the logic board, scorch marks, any burnt smell, or anything obvious). It's unlikely, but I wouldn't dismiss the possibility.

If you don't have the tools, you can get them through the Parts & Tools section of the site. The ones you need will be at the beginning of the guide (you can click on them to access their respective pages).

I hope this helps!


To repeat the comment above, here's a link to a similar thread on the same machine. Thanks to mayer for this bit of diagnostic advice:

iMac - no power, number 1 diagnostic LED on

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+ thanks for the add, with an accepted answer sometimes it's hard to add things


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Did you get any solution to that problem?

My 2118 has absolutely the same symptoms including clicking at the rear.

Could that be caused by the internal battery had gone flat?

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dan chalkley wird auf ewig dankbar sein.
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