T42 Display appears with small red boxes then goes black

When I power up the display looks like a checker board with small red background squares all over the display.  I can read through them and see the display but after 3 to 5 minutes, the entire display screen goes black.
Any ideas?  All will be much appreciated. 
Thanks

Your GPU (video card) has gone south. Read my reply to your other post regarding the same question...
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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