オリジナル投稿者： Albert Einstein ,
There is a sensor cable on some iMac models that must be attached to the replacement HDD for the fans to operate normally. I do not recall if the particular models include your mid-2010 iMac but the symptom you describe would be consistent with this requirement. If you did not buy it from OWC / MacSales or other well-known Apple supporter, it is unlikely to have the required hardware. Check with OWC to determine the correct replacement you require. '''It's an issue in your lower slot'''