1) Formatted the SSD 2) Done re-set setting options on start up (SMC) Not sure where else to go. If open a few tabs in chrome or safari you heard CPU start speed up. I had logic board replaced due to issue with video card(known issue coverd by Apple in Jan of this year). The computer does seem get hot as well. Not sure if this change or not. I haven't had any issues related to this other then fans just being annoying. Any ideas? I just bought iMac 5K and off warranty so prefer not take into the store if I don't have to.