Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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How to tell if its power supply or motherboard problem?

I've got an iMac EMC 2308 I'm working on. Once you press the power there is no video, no bong and nothing on the display but I can hear the hard drive spinning and a slight fan noise. How can I tell if its a bad power supply or motherboard?

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Did you find out which part was broke? My EMC 2308 is doing the same thing and so far no post i've found has helped much other than by saying it is either the logic board or the power supply.

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There are indicator lights built onto the motherboard that will light up to show you what parts are getting power. Here is a post that should help you.

Where are the diagnostic led's on this model's logic board

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