well, open it up.
turn it on.
after about 20-30 mins of playing around with iMovie or another program that uses the processor, put your hand on the left side of your laptop. Or... put it somewhere else on the laptop. If you say ouch, ouch, ouch - you might be in the normal heat range.
If you're worried about the whine, the best software for it is to put your ear right next to the computer and listen and listen good. Whine?!!?!?
Some of the best software testin' out there was provided by God.