Either the fan or the computer processor is making loud sounds "like what a room fan would make" why is this?
13inch mid 2010 macbook
Processor 2.4 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 320M 256 MB
Software Mac OS X Lion 10.7.4 (11E53)
It could be your motherboard. I have the same computer and a couple months after I got it I noticed that the fan would go on and off constantly and it was so LOUD. I called AppleCare (when I had it) and they told me that it was a faulty motherboard. One thing you could do before calling AppleCare is do an Apple Hardware Test.
HOW TO: On an Intel based Mac, insert Mac OS X Install disc 1 that came with your Mac to your Mac, and hold letter D at boot. This will load it to the hardware test. After language selection, use ctrl-L keyboard combination to get it to loop mode, and select extended test, and let it run at least for a few hours. You can end the test with the same keyboard combo, or it will stop if it finds an error.