Hi, this morning i turned on my Powerbook g4 1.25mhz os x 10.5 and it worked fine for about 5 minutes then the screen became garbled. The screen itself seems fine but the video is garbled (you can kinda make out whats on the screen if you look hard enough). I rebooted, tried different ram (ok i was grasping at straws...) is it likely a motherboard issue? I am thinking the video hardware on the motherboard is failing? please any advice on how i can troubleshoot or fix this would be most appreciated.