macbook fan always on

You don't want to stop the fan from running, they are doing that for a reason. What you need to do is find the reason why your processor is heating up. Solve that and the fans will slow down.

Now can you be a bit more specific about your problem? Are you saying that the fan is fully ramped up as soon as you open the computer? Because that wouldn't be normal!

Welcome to Apple Support Communities.

Have you done an SMC reset? One of the symptoms that a reset is needed is that the fan runs at full speed constantly.

http://support.apple.com/kb/HT3964

I see that you're on OS X10.7 'Lion'. How much system RAM is installed? Lion needs more RAM (2GB minimum, but 4GB preferred) and uses more microprocessor, in part because older video chipsets such as GMA950 provide less performance in older systems.

There’s one problem with running your MacBook with the battery removed. MacBooks and MacBook Pros automatically reduce the processor speed by about half when the battery is removed.
http://support.apple.com/kb/HT2332
http://www.tomshardware.com/news/apple-macbook-pro-battery-benchmarks,6643.html

If you have a MacBook with the removable battery you can get a new third party battery fairly cheap on eBay.

Black Batteries http://shop.ebay.com/i.html?_nkw=macbook+black+battery&_sacat=0&LH_BIN=1&_sop=12 &_dmpt=Laptop_Batteries&_odkw=macbook+white+battery&_osacat=0&_trksid=p3286.c0. m 270.l1313

White Batteries http://shop.ebay.com/i.html?_nkw=macbook+white+battery&_sacat=0&LH_BIN=1&_sop=12 &_dmpt=Laptop_Batteries&_odkw=macbook+black+battery&_osacat=0&_trksid=p3286.c0. m 270.l1313

Or for $129 from Apple http://store.apple.com/us/product/MA566LL/A?mco=MTY3ODQ5OTY

Make Sure your computer is able to pretty much breath dont rest it to long on carpet or pillow or a bed because the heat will stay in and the fan will run

michael echsner

Glad I could help.

Some early MacBooks can only use 2GB RAM, and some like my mid-2007 2.16Ghz can only 'see' 3GB.

OtherWorldComputing (among others) provides a free guide to how much RAM your Mac can use: http://eshop.macsales.com/shop/apple/memory/

well I had the same problem and then I found out that 5 apps were running at the same time, and also my hard rive was pluged in. when I unpluged it the fan actually stoped!!