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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Why is my iMac not powering up?

My iMac is not powering up.

I checked the power chord.

Held in power button for ten-seconds then press again. The diagnostic lights flashing off and on non stop even when pressing the power button. But does not start

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If those are diagnostic lights have you checked your owners manual or online for the information they are trying to tell you. Is the flashing displayed in a repeated sequence? If yes, then that information would be potentially useful to be posted here.

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Thanks for replying to my question

As so as the Mac is plugged in.

The first light that indicates power from the PSU stays on

The other 3 flashes together every five seconds without the power being pressed

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Reseat your RAM. Try just one stick in each of the slots at a time to test both the RAM and the slots.

iMac Intel 24" EMC 2134 and 2211 RAM Replacement

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Terry Dixon will be eternally grateful.
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