IBook G4 14" freezes at start up or just shows vertical color lines

Hello, I am struggling with my 14" iBook G4. It either freeze at the early phase of starting up with gray background/apple icon, or shows vertical colorful lines on the screen. I tried to wipe out the HD and reinstall OS, it froze during installing. Whatever is shows on the screen does not mirror to an exteral display. I don't know if anyone has experience on this, a display issue, HD issue, or a more serious logic board issue. By the way, I was able to install OS TIGER on its HD by starting it in target mode and hooking up to another ibook with firewire cable. Any suggestion will be very appreciated. - I am not very experienced with Mac, trying to learn more at this forum. Thank you.

Hello, Cornelius. I am back. Here is what I did. I inserted the hardware test disk, restarted computer, while holding down "c" key. I could hear disk spinning. The colorful lines showed at begining, then they went away, leaving faint backlight on the screen, and DVD drive went silent. Then I restarted it, while holding down apple+L keys, like what you suggested. Disk spins, colorful lines stay, and then everything goes silent. While I was doing this, I hook the mini DVI port to a CRT monitor which I know works well for my powerbook. But no video signal was transferred to it at all, except a turning-on signal. I have another disk says "applecare protection plan", aslo says"techtool deluxe". I don't know what this is for, should I try this? I will be waiting for your or other pros' further instruction. I feel the frustration, but enjoy the learning process. Thank you very much for your precious suggestions.

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