crwdns2934241:0crwdne2934241:0 cyqCYNTVX67

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I just tried i7-4790 on my iMac 2013 27 inch, it wouldn't post, the LED has 1 light, 3 dark. so I know power connection is correct.

but no peep sound, so i don't think it's the RAM, because when i had problem with RAM before, the system would make peep sound, i think it was 3 long and pause (i forgot, it was 2 month ago)

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open