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モデル番号A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3もしくは3.6 GHz Core i5プロセッサ

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I installed a new hard drive + 4Gb RAM, but somethings wrong.

Following the iFixit instructions (and with a helpful hint from Dan), I managed to replace the original WD hard drive in my EMC 2389 21.5 inch iMac. I put in a new WD 1Tb drive and added 4Gb RAM. As far as I could tell, all connectors were replaced correctly. But when I pressed the start button and held down Command / R, nothing happened. The external drive on which Time Machine is installed blinked repeatedly (three flashes then rest), but nothing else. How do I troubleshoot this?

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Did you ensure that the RAM you bought was compatible and matching with the other stick of ram?

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Agreed! Take the new RAM out and finish setting up the HD with the original RAM.

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OK. New RAM may be a problem. When removed, I can hear the usual 'boot-up ballad' of whirring noises. The Time Machine does a couple of 'blip cycles' then settles down, but, nothing on the screen! Could it be I have somehow incorrectly inserted the screen connector? It did 'pop' out rather unexpectedly. How might I tell if this is the problem? If it is the problem ... have I killed the machine entirely? So many questions. At least the Start/Shut-down works correctly!

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Graeme さん、ありがとうございました！
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