Macbook A1278 screen goes white after 10-20 mins of use???

Okay i picked up this macbook  A1278 i dont know if it is 2.0 or 2.4 ghz yet but after about 10-20 minutes of use the screen slowly will fade white can anyone suggest what the problem might be? Thanks.

Hi ...
Hopefully you were able to get the install discs that came with the Mac so you can run the Apple Hardware Test.

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