Occasional Vertical Lines and Black screen

Hi. My powerbook just went out of applecare coverage in August. In May, my display started to flicker, going black with about 7 vertical purple and blue lines on the left side of the screen. I ran fsck, etc., and nothing was wrong. It only happened briefly at first, so I ignored it, but eventually it happened so often that I couldn't work for more than 5 mins, so I decided to go to the mac store. The mac store could not replicate the problem, but sent it out for repair. A new keyboard and logic board later and everything seemed to be fine. At least until August, right when applecare coverage ended. The problem is now happening rather infrequently, but I'm concerned that it will again become permanent like last time. Given that I am no longer covered, I was wondering if anyone had any advice on how to fix this myself. I've run fsck but nothing appears to be wrong. The fan is also over-working itself lately, which didn't happen the first time around. Thoughts?

Welcome to the Apple discussions.
You might return it to Apple, and ask them to fix it correctly this time. Generally, issues that start while under warranty, but are not fixed, will be covered, but it's on a case-by-case basis.
What you describe sounds like a video circuit issue, and with the video circuit embedded on the logic board, replacement is the solution, as Apple did when you took it in for repair. You can run the Apple hardware test, or use one of the TechTools products, to test the video circuit.

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