computer overheats

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I have a Gateway 400VTX laptop.  Recently, I have two problems and I
wonder if they are connected.  First, the computer overheats and then
turns itself off.  Second, sometimes, when I close the lid, the screen
would become dim but would work again when I turn the computer off and
back on.

About a year ago, I replaced the backlight inverter.

Any suggestions for a possible cause of these problems?  Any chance
that the two problems are related?


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