I recently replaced the trackpad in my mid 2009 MacBook Pro. It now works fine. But upon restart, the fan runs at full speed from startup. It even turned itself on once while it was "asleep." I rac Activity monitor and nothing is using an undue amount of cpu. It never did this at any point previously. I am running System 10.9.4 w/2 GB RAM. I zapped the PRAM, reset the SMC, removed and replaced the battery. I am curious if it might be a thermal sensor related to the fan. if so, Is that replaceable? Is it possible that I disconnected or damaged it when replacing the trackpad? I am really lost here.
Thanks.
Bryan