Example YouTube to follow.
https://www.youtube.com/watch?v=EWwejCKVGOY
I only have to open laptops that were never cleaned.
Bob
laptop - lenovo z580 ideapad , 4gb ram , windows 8 64 bit,i3 processor.i bought it in 2013.suddenly my internet connection becomes limited.when i disconnect and connect,my laptop freezes and shuts down.and sometimes,it heats up and shuts down,and sometimes,it becomes slow and then shuts down.i tried re-installing windows,refreshing my pc,re-installing my network adapter, but it seems to be of no use.

Chowhound
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TechRepublic