G4 froze, screen filled with rainbow stripes, won't restart

My powerbook G4 was transferring some files across my wireless network while I was on Firefox, just surfing. Suddenly everything froze and several one pixel wide vertical coloured lines appeared. Then more and more till the screen was full. Nothing responded to input - keyboard, pad, etc. I left it for a while then powered it down. Now it won't restart. Machine was running kinda slow, but I thought it was because of the wireless transfer, but not unusual. Didn't notice any fans going nuts either. Any suggestions? Thanks!
1.33ghz, 2 g RAM, osX Leopard

jon_eh, welcome to Apple Discussions.
Which direction were you transfering files - from the Mac or to the Mac? Was your hard drive almost full?
Not sure if you had a hardware or software problem. My only suggestion is to try a PMU reset.
 Cheers, Tom

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