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Using canned air should clean the dust out, just don't tip the can or the liquid could come out. If the HSF is hard to get to with the spray air, you can remove it. You will need to have thermal paste and something to clean the old paste off with before you begin.
Also, if you remove the heatsink, don't forgrt to reapply the heatsink thermal compound
Mark why won't my laptop work?
Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits Become a BleepingComputer fan: Facebook and Twitter