Hello everyone!
I'm facing a serious issue with my iMac 27" from 2011 and can't seem to find a solution. Here are the main problems:
- All fans are running at maximum speed.
- The CPU is throttled to 1.7 GHz.
- The GPU is running at only 20% of its capacity.
- After waking up from sleep mode, everything works normally for about 10 seconds, but then the problems come back.
Here’s what I’ve already done:
- Replaced the CPU (with an i7).
- Replaced the logic board.
- Installed new RAM.
- Replaced the SSD (from a Samsung 840 EVO 500GB to a Samsung 870 EVO 1TB).
- Installed a special temperature sensor for the SSD.
- Reinstalled macOS High Sierra.
- Reset NVRAM/PRAM and SMC multiple times.
I’m using *Macs Fan Control* and *Intel Power Gadget* for monitoring, but nothing changes: the CPU stays at 1.7 GHz even under load, and the GPU runs at minimal capacity.
Has anyone encountered a similar issue or has suggestions on what else I can try? I would really appreciate any advice or help! Thank you!
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