Screen goes white on gateway laptop M305crv

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Laptop screen went white.  Would not recover, until 3 weeks later,
tried it, came back.  Work for 3 weeks, now goes white after being on
for about 3 to 10 minutes.  Will recover if left off for a while.

Had another known good M305crv with no harddrive, some gave me for
scraps.  Replaced the screen(note went from 14in to 15in, had to
change the cover also.  Changed the small board below the screen also.

Problem did not change.  Is my problem the motherboard, or is there
something I else I can try.

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