L Helps said:
My Acer Aspire 5742g was overheating when playing games so I opened it and blowed out almost all the dust.
It isn't overheating any more but still reaches 85C max when gaming. When the cpu gets over 80C it begins to lag (when playing games)
So my question to you is: what should I do, apply new terminal paste?
For a laptop getting high temps during gaming is normal. Laptops aren't really good for gaming and even those 1000 dollar gaming laptops get pretty hot. You just can't put that much power into such a small confined space and not have heat problems.