I have a late-2009 MacBook Pro. When I turn it on, I get the blinking file-question mark icon. Tested the hard drive from it on another MAC, and it works. Tested the RAM on another MAC, and it works. Ran a Hardware test from an apple DVD, and it gave me "4mot/1/40000002: exhaust-0" error (fan problem). I checked, and the fan isnt working. What could be the problem that it doesnt boot up??