Do i have a faulty logic board?

the screen on my powerbook displays bizarre patterns if it shows anything at all. If i boot the hard drive on another mac, it works fine. When the problem first occurred it happened once and then nothing for about another week. After that it would happen almost every 30 mins and gradually depleted in the time it stayed lit. At this point i started getting images like this:
http://good-times.webshots.com/photo/2700502750093507103rAwDZx
Any ideas what is worng?
ANd here is some more backgrond info
I used it all the timw, i rarley shut it down.
Model 12in powerbook g4 i got it around april 2004.
macbook powerbook   Mac OS X (10.4.8)  
macbook powerbook   Mac OS X (10.4.8)  

Welcome to the Apple discussions.
If you haven't already, you should run the Apple hardware test. Insert the first OS X DVD that came with your system (may say AHT Version x.x in small print), reboot and hold the option key down. Choose Apple hardware test and follow directions. Choose the extended test. If you have TechTool Deluxe or Pro it can do the same testing. Does it point out any issues?
If you have a video circuit issue, since the video circuit is part of the logic board, you'd be talking a logic board replacement.

Similar Messages

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    Then I drove 2.5 hours and dropped $100 for DiskWarrior. Another 2.5 hours later DW was a "No go". Starting from the the DWarrior CD (holding the "C" key, of course), I didn't get beyond the "prohibatory sign." Alsoft's tech support Rep was very responsive, and offered various suggestions (thanks Marc!), and he finally concluded that there is an obvious hardware problem with my computer.
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    If you really want to get it fixed instead of buying a newer portable, I would recommend that you check out DT & T Computer Services in Fremont, California. They do free diagnostics and will do the repair on the logic board for about the same amount you would have to pay to just buy one. They also do hard drive replacements/upgrades (scroll down on the page). I would ask for a little bit of a break on the installation fee for the hard drive if they have it open to repair the logic board, anyway. DT & T also gives a six-month warranty on the repairs.
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    About 8 hours after receiving it, my MacBook would not turn on. Called AppleCare and was told to bring it into an authorized service depot. Diagnosed as a faulty logic board, it was replaced and it's been fine ever since. 2 weeks and counting...
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    final cut express
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