Black Macbook Overheating/Shutting Down

[Shotgun OS]

Hey guys, over the past few weeks my blackbook has been shutting down more and more frequently from what I can only believe is overheating.

I just checked my computer upon startup with SMC fan control - it starts up at about 70 C and at about 3500 RPM. Yet, after a few minutes, the fan immediately drops down to 1100 RPM or and fluctuates between 800-1400. I try to force the fans to spin with SMC Fan control, but nothing happens.

I've looked all over the web and I can't find anything definitive. I know that macbooks tend to overheat. What can I do?

I'm at college and I really need to find a fix for this as soon as possible. thanks.

 

[rampancy]

Try starting up your Mac in Safe Mode - it's very likely that a runaway startup process or some corrupted file in your user System folder is tying up your Mac's CPU, driving your system temperatures skyward.

 

[Shotgun OS]

Try starting up your Mac in Safe Mode - it's very likely that a runaway startup process or some corrupted file in your user System folder is tying up your Mac's CPU, driving your system temperatures skyward.

How might I go about doing this, and what do I do once I boot into safe mode?

 

[doubleohseven]

Is the battery ok? A problem with the battery may cause your MacBook to shut off randomly, and it may also be the reason why your MacBook is over-heating (same thing happened to me...I noticed the battery power was chewing away as the fans blasted at around 3000RPM!)

Also, try calibrating your MacBook. Here's how - http://support.apple.com/kb/HT1490