http://www.laptoprepair101.com/lapto...-turned-white/
I would look at correcting the heat issue before anything else.
Never,
never,
NEVER run a laptop on a soft surface, such as upholstered furniture, carpet, or your lap.
Always use a desk or similar
hard surface.
If you are taking your computer apart, take a can of air and give the whole inside a good once-over, taking care around the mainboard. Make sure the fan gets a good cleaning. You can use a cotton swab and isopropyl alcohol to gently clean the fan blades.
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