Why CPU fan runs at full speed?

Hi Guys!

I have a problem with my macbook.

Few months ago I replaced my spilled keyboard and after that iSight camera doesn't works anymore.

Today I decided do fix it. After disassembly I noticed that there is some deformed pins in camera/wifi connector. I fixed that and after booting my mac I was surprised - the camera works. I make a FaceTime call and camera really works great, without any problems. But later i noticed that CPU fan spins at max (sounds noisy) and CPU runs at only 796 MHz all the time. I was trying to boot with unplugged camera connector but it doesn't helps.

Please tell, what can I do with it.

Thanks.