Blank blue screen always appears after Apple icon
Hi! I often get iBook G4s that can go into the option menu and target mode, but when you select a volume to boot from, or let them boot to the hard drive, they go to a blank light blue screen and then stall. This happens immediately after the Apple icon screen. The Apple icon screen will disappear after a while, there will be a sort of a flash of a screen refresh, and then the laptop will sit on a blank blue screen, and that's it. I've tried all the typical stuff -- removed the RAM and Airport, done PRAM/PMU resets, swapped the hard drive, tried booting to an external drive, etc. It doesn't matter if you try to boot to the internal drive, external drive, or restore media.
I can only assume it's a logic board issue, because I've tried everything I can think of. There are a lot of machines like this, and it's frustrating to let them go, because they seem like they are close to working, and it feels like I'm missing something.
Is this a good question?