Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Why did my Mac shut down & wont power up again?...

iMac Model A1224. EMC 2133

My iMac turned itself off & wont turn on again. When attempting to turn it on it felt as if there was no power going to it. I checked the power cord & power strip, not the problem. How do I find out if it's the power supply, adapter or the Motherboard?

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Take the frame off and observe the diagnostic LEDs to the right of the RAM slots. #1 will be on if you are getting power to the power supply. If no light on #2 when attempting to power on, replace the power supply. Heres how to do it: iMac Intel 20" EMC 2133 and 2210 Power Supply Replacement

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Still can't find the LED lights.

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