MacBook VGU has died 3 times in a row with only a few days running

Hi,

I have a 2011, 17" macbook pro and it will not boot past when it changed onto the graphics chip (3/4 into book), i cannot get safemode as same thing happens and the diagnostics doesn't seem to work (holding D).

It went into for a new logic board a few months ago under the special warranty apple put out for my specific model with the chipsets solder becoming unstable.

This has now been back 3 times for 3 logic boards in total, and the last 2 times the laptop only ran for a few hours prior to getting lines across the screen and back to square one.

Does anyone know of something i can attempt to bring this back to life. Currently the only issue i have is it not booting past the graphics chip boot up, when it gets to this section theres a quick flash of a black line across the screen around the middle and then it goes black then the white screen comes on and nothing happens and eventually it turns it self off.

Im open to any suggestions no matter how crude or outlandish as its essentially dead and the 17s arnt made anymore.

Cheers

Brad