This reference may help if the problem is overheating:
http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us〈=en&docname=c01657439&product=4121109
I would normally prefer to open the case and blow/suck the dust out but this is not so easy with some laptops so I guess that is why HP recommends blowing the vents clear - although I'm not sure where the dust goes!
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