Chosen Solution
Hi, I have Macbook pro 1,1 A1150.. 2GHZ [Up to Dated SMC and firmware] The system fans never kicks in, It seems that they stay at 999 rpm even with high CPU usage and it is burning hot.. I ran Apple Hardware Test and all test are passed…. When I ran the temperature software it shows the temperature of CPU idle 50+C and the Fan is 999 RPM.. I even installed iCyclone to control the temperature it does a good job but only if you are inside OS. If i get in to Single user mode or watch Youtub it almost burning and freezes … I did a SMC and PRM reset.And a clean install of 10.5.4 still the same problems. Plz help me what is wrong with this stupid mac bookCON….i m new to mac and i was not expecting that mac would be like this.. Thanks
A CPU should never be at 50+C under load much less at idle. I really doubt your fans are the problem since you can increase their rpms with iCyclone. It sounds like what tells the fans to turn on and increase their speed is the problem. Possibly you have multiple problems. I would start with replacing your heatsink and the sensor on it. You can get this on eBay for $10 or less. Instructions for that are here. If the heat pipes (tubes on the heatsink) have been compromised they no longer function properly and don’t bring the heat to the cooling fins. They contain a small amount of a liquid, usually ammonia, if it has leaked out then nothing in that system is working properly. The heatsink is not pulling heat from the chips as it should and even if you max out the fans they aren’t doing their job either. The fans do not cool the chips they cool the fins at the end of the heat pipes. If the heat pipes are bad the heat doesn’t even hit the left or right thermal sensors to tell the fans to kick on because the heat pipes aren’t drawing the heat to the fins through the heat pipes. During the process of replacing the heatsink you will need to replace the thermal compound. I suggest using Arctic Silver 5, you can find that here. If this doesn’t solve the problem I would replace the left & right thermal sensors. You can get them for about $5 each on eBay.
So, if you use a fan controlling software (like SMCfancontrol) it doesn’t work? And you have reset your SMC and PRAM, which means its most likely the fans itself. Buy new ones here.
My Macbook fans run extremely fast and the CPU heats up but only when I am on e-bay.com. Why is that? Do they use a process hogging HTML page? Confused
