Faulty Macbook with symptom: Two screens in single screen

I just got a defect macbook pro 15" from aprox 2007-2008. It is not possible to get repairs on warrenty, so I want to try and fix it myself as cheap as possible (as it is an upgrade from my macbook).
The current OS installation on the machine is Windows 7 (not with Bootcamp). Starting the machine goes fine(the sound and the gray screen), but when it starts loading drivers and checking hardware and such (not quite sure what it actually does) the display is split horizontally and not pretty. It is almost like a vertical interlacing gone bad, where half of the "laces" are scaled down, and put on the top part of the screen, and the other half of the "laces" are put on the lowerpart. So the display is split in half and are showed on one screen. Both of the displays are striped with blank pixel stripes from top of the display to the bottom of the display. The computer still runs fine (it has not crashed for the few times I've started it and tried some fidgeting) only that there are these twin screens in the single display.
What I'm wodering is if anyone else have encountered this kind of problem, and if there is a fix to it? Can this be an artifact caused by bad soldering or overheating of the graphics card ? Is it something that might be fixed with baking, or some other simple or cheap solution ?
The macbook has been evaluated by a store, and it said that a logic board switch was needed (kernelpanics and such). I don't see the reason why a faulty logic board would cause this screen artifact. So I thought that the store just found that a switch would be the simplest solution, and not thought it was worth the trouble to try to repair or resolder or something.
-Snuku

I did a "f* it, I'll just try" thing, and baked the logic board.
This solved the screen issue, screen is back to normal without any artifacts.
Have not checked if it solved the kernelpanics and crashes. Going to reinstall some mac os and hope for the best.
Hoping someone might have future use of this, to save a broken macbook.
-SnuKu

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EDIT: RESOLVED
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http://support.apple.com/kb/TS3742
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http://reviews.cnet.com/8301-13727_7-10344626-263.html?tag=mfiredir
http://www.macworld.com/article/2027201/how-to-troubleshoot-a-kernel-panic.html# tk.nl_mwhelp

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<http://homepage.mac.com/strait/Sites/Macbook/pages/MacBook%20Freeze%20Screen.h tm>
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Exactly the same screen as the first poster.
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Faulty Macbook with symptom: Two screens in single screen

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