4 Replies Latest reply: Jan 31, 2013 1:22 PM by baltwo
Barbara Hahn Level 1 Level 1 (0 points)

My hard drive was replaced by an Apple contractor last week. Immediately after the replacement the fans started running hard while working and would wake itself from sleep mode to run. I watched the Activity monitor as someone suggested, there are no "runaways." I zapped PRAM, and SMC multiple times. No change. Finally tonight I ran the hardware test and got the error message 4SNS/1/40000000:TH00-9.000. I then went to the support community and found that this relates to the hard drive and circuitry for fan sensors. It did not do this before. I will call the person at Apple that was my contact for the replacement on Monday. Just trying to verify that I have interpreted error message correctly.

Mac OS X (10.7.5)