Chosen Solution
Hello, I have old iMac Intel 27" EMC 2429, under OS X, tried many versions, my CPU is not turbo boosting at any time, it works at 1.6ghz, and my GPU is working at some 30% of speed it should work at. On the other hand, under windows bootcamp my graphic card is working at 100% but CPU is still not turning turbo boost on and i get flat 1,6ghz. I don’t have screenshots on my home computer to show for but if anyone has any idea what can be the reason behind this it would help me. p.s. i have noticed GPU flow (not right away) after graphic card replacement, sadly after 3 months of replacement guarantee have passed.
Update (07/26/2018) Ok @danj it seems we are on right track, it looks to me like they are tore off in my case too, what is my next move? :) do you know what exactly i need to buy to soldier on?
Update (11/12/2018) screenshots after fix
Can you give us some background here on what you’ve done with the system. Like did you replace the HD, add a second drive or remove the logic board? Update (05/31/2018) @predragns OK I think I know what happened as it happened to me! In the process of removing one of the sensor cables (AMB TEMP) I damaged one of the coils. Here’s the area you’ll need to inspect:
Is either L5500 or L5501 coil missing?
Boot it up from an external USB drive running El Capitan. Did this happen after an Apple update? This is what I had to do to a 2012 27" iMac that had done the same thing as yours. The 10.11 runs perfectly.
