I've read a lot of the threads regarding the fans in the MBP running constantly. I have MBP (system serial: #W89458HN642) running SL 10.6.2 purchased in late January of this year. A few days ago, I noticed the fans started running non stop at 6192 rpms! This was true whether I was using it or whether it was sitting on the table. I installed smcFanControl with no effect other than I noticed that the temperature read by smcfancontrol was 32F for a second then 117F while istat was reporting a CPU and heatsink temp of 45F?! I ran Apple's Hardware test and I got the following error code: 4SNS/1/40000000:TCOD-128.000 (short test) then another after I ran the longer test: 4SNS/1/40000000:TNOP-128.000 I wiil try zapping the PRAM next. I also started up from a safe boot, no affect. Any guidance would be appreciated.