2015 iMac runs slow and fan running fast after replacing display.
I replaced it with a surplus display I had for a 21.5” iMac. I thought it was a retina display. I ran TGPro and, under Diagnostics, it returns an amber button next to Temperature Sensors with the following text: These sensors may not reworking properly: Unknown name.
Does anyone have any ideas on how to troubleshoot this further. FYI: I do not have the original LCD display.