I have a Mac Pro 1.1 that I upgraded from 2x 2.66GHz dualcore processors to 2x Intel 5365 3 GHz quadcore processors. I flashed the firmware to Mac Pro 2.1 as well.
The problem is that the fans now run at full speed (2700 rpm and reporting constantky 128 degress Celcius from startup). And I have no control of the speed through SMC fan control either.
Any suggestions how to solve the issue?
1. Either you damaged a thermal sensor.
2. Or you forgot to apply thermal paste, and or applied the wrong quantity.
A PRAM and SMC reset has already been done?