Mid 2011 27inch Not booting After CPU Upgrade
My 12,2 iMac works flawlessly with the i5-2500s it came with. But refuses to show any sign of life with an i7-2600.
Nothing happens when I press the power button other than a small hum.
Removing the display gives me access to the LEDs showing 1 and 2 are lit but nothing from 3 or 4.
The 2600 is a known working chip and the 2500s still works fine in the board.
Please help.
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@danielfrearson that is a i7-2600 and not a i7-2600S? Your iMac does not supply enough CPU power for the non-S and that is why it does not boot.
by oldturkey03
@oldturkey03 That's not an issue with the 27inch model. It wasn't really a common problem with the 21.5 inch model due to the weaker PSU either.
Here it seems to be an issue with my specific i7 2600 I fear. I've since tested an i5 2500K which has the same TDP as the 2600 and it worked first try.
by Daniel Frearson