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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?

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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.

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Reading your update I now agree with the GPU issue, no relation with the U28 problem.

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Actually, your iBook might be suffering from a failing GPU chip/connection. This has plagued iBooks (G3's and G4's) and can only be fixed by reflowing the GPU solder, or replacing the logic board. See this question: Why does my iBook randomly freeze?

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There's a documented issue for the iBook G4 who has the fellowing symptoms at boot up: no chime, screen stays black, fan runs full speed, no other activity.

This problem is often related to a IC power regulator named U28 and located near the DC in board cable socket under the iBook G4 logic board. The IC power regulator has 40 pins but only the pins 1 and 21 can be desoldered from the logic board and causing a power issue at boot up. Just briefly applying a fine tip from an iron solder gun to the two pins to resolder them can restore the IC communication with the logic board. A Google search would give you more info about the U28 issue.

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