I would reseat the possessor, & use new heat sink compound
 
 
In a message dated 10/15/2011 10:11:25 P.M. Central Daylight Time,  
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I  have two Dell Latitude D630 laptops running Vista Business and one  
D620 running XP. All three were in my to be scrapped  pile  because I 
couldn't get a video image either on the laptop or on an  external 
monitor. Maybe I'd get an image one out of 10 tries (turn  on) if at all. 
It appears the backlight is on, and the computer  seems to be running. I 
have tried all the things I can think of,  including replacing memory, 
HDD and with and without battery. I gave  them one last chance before 
parting them out and lo and behold, now  they seem to work reliably.
Sure looks like a GPU chip, but I would  expect them to die completely. 
Maybe they were just tired and needed  a rest!
Any ideas of what's going on?

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         PCBUILD maintains hundreds of useful files for download
                     visit our download web page at
                  http://freepctech.com/downloads.shtml