Powerbook Al 1.25GHz screen shows yellow boxes/lines

My five year old AlPB recently started showing yellow lines/boxes on the screen. The first time it happened I was in safari and quitting fixed the problem, it then happened later that day and quitting didn't fix anything. i rebooted twice with no luck, then booted up with leopard DVD and it was fixed. A week later the same thing happened and after multiple reboots nothing fixed it. I reset the PRAM and no luck. Then i ran the hardware test and halfway through the test while it was checking the RAM it fixed its self and everything passed the test. However after waking it from sleep twice it has again showed these lines/boxes (but now only in the finder not in other applications) and a restart has resolved the issue. Does anyone have any idea what could be causing this. I took a screenshot and the picture contained the lines indicating that it is a hardware problem not the LCD. Thanks for you help.

From what I gather, there is a whole slew of us with all the same problem whether its single lines that multiply as time goes by or for us earlier ALPB owners, we get a whole screen full of intermittent checkered patterns, but since these machines are all a couple years old and out of warranty I am pretty sure Apple is not going to be much help. They'd rather us dip into our pockets and buy new computers than to spend some big bucks themselves and stand behind their products.
The only good news is that if you are handy enough to disassemble the machine and send only the logic board to a reputable lab, they can re-solder the video chip back in place and this solves the problem for about $60 to $100. This seems to be better than dishing out anywhere between $250 to $700 for a new logic board, which runs the risk of having the same defect 2 to 3 years down the road since they don't seem to have been built right the first time.
If you want to know if you have the exact same problem that most of us all have, then press on the case above the track pad or from the bottom in about the same area. Not hard, but just enough to flex the logic board a little inside. You will notice that it temporarily fixes the problem, but don't get too happy. Working that lose video chip back and forth only worsens the problem, so soon you it will be to a point where it will only help if you constantly hold pressure in a key spot which is unique to each PB.
It's too bad though. I was just beginning to really think Apple was different.

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Powerbook Al 1.25GHz screen shows yellow boxes/lines

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