Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Black screen and beeps will not boot up

On powering up my imac the screen remains black and beeps @ 2second intervals, can anyone HELP!

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Try reseating your RAM one stick at a time. While in there check the capacitors for swelling and/or corrosion. Next, observe the diagnostic lights in the middle of the logic board and let us know how many come on when you try to boot. There are two button switches to the left of the diagnostic lights, one resets the machine the other restarts it - push these.

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are the two button switches accessed through the ram space??


Try looking to your other left.


reseated ram - nothing.

removed ram and turned computer on minus ram. turned ofF and refitted ram. turned on again and FIXED!!!!!!!!!YAY

fixed by accident so to speak.


Awesome!!! Just when I thought my iMac black screen was hopless, I followed dstee's steps and in addition I replaced the two rams in the two empty ram slots. AMAZING!!! A white screen and it completely booted!!! Thanks!!!


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Here you can find a list of iMac Beep codes which should help you figure our where to start in diagnosing your issues.

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