Ahd Tells Me A Faulty Gpu Temperature Sensor Imac Intel 21 5 Emc 2428
Chosen Solution Not sure the bit about all the fans spinning up is accurate. I’m looking at a Mid 2011 iMac 27" with (AHD tells me) a faulty GPU temperature sensor (4SNS/1/C0000008: TGOH–124). The ODD fan spins up (which makes sense as the GPU HeatSink is above the ODD fan/drive. However, the HDD fan doesn’t. The CPU fan however does. Maybe it’s only the big fans that spin up? Or I’ve also got a faulty CPU T sensor but just don’t know it yet....