Following these instructions i simply replaced my hdd with an ssd.
Imac ssd temperature sensor fix.
The imac hard drive has an integrated temperature sensor the imac fans will run at full speed if you replace the hdd without the temperature sensor and or proper connector.
I ve booted from an el capitan installer flash drive formatted the ssd and am installing el cap as i write this.
Hello if you decide to buy the thermal sensor from owc you will need to plug the cables and stick the thermal sensor on any part of the ssd.
I have a 21 5 mid 2010 imac that i just replaced the hdd with an ssd on.
I currently have it at 2500 rpm which is quiet enough but can i permanently set it a bit lower.
This hack fix bypasses the hdd temperature sensor in order to fool imac into thinking that hard drive is working at normal temperature.
I simply diconnected the cable that normally connects between the hdd temp sensor socket on the main logic board and the hdd from the hdd but leaving it plugged into the logic board.
Imac hard disk removal imac ssd upgrade thermal sensor link posted under description imac 27 harjindersidhu sidhudiy easysteps use screwdriver t8x50.
Running macs fan control but don t know what to set fan speed to.
Sorry to resurrect an old thread.
I just installed a 480gb sandisk ssd plus in a mid 2011 imac with no external thermal sensor on the old drive.
Obviously nothing to connect the 8 pin temp sensor to.
Other world computing outlines faulty temperature sensor connections may be to blame for an imac s fans blaring after a hard drive upgrade.