screen flickers, then system crashes
For the past day my laptop has been crashing. It will run for about 5-30 mins just fine. All of a sudden, the screen will fail (it will sort of "swipe cut" with a rainbow trailing edge). With a few attempts, i can get it to come back on, but only after turning my laptop off, then back on (sometimes it does nothing but run the fan for awhile without turning back on)
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Ok so heres an update. Got the laptop to run for an hr then it turned it's self off. I then plugged into my LCD TV to make sure it wasn't just my screen. Didn't work. It now will start up for about a minute, then it shuts down (with the same "swipe cut" movie effect). Only did the running fan thing once. Does this still sound like a GPU?
Yes, it does. the "running fan" was most likely related to the GPU. I hate to say it, but you probably have to either replace or repair your logic board. If you want to confirm this, run it, and apply a decent amount of pressure to the left of the trackpad. If artifacts appear on the screen, or it does the "swipe cut" thing, then you do have an issue with the GPU.
por Chris Green
Reading your update I now agree with the GPU issue, no relation with the U28 problem.