15" PB G4 won't boot up - please help!

Not sure if these issues are related, so I'll give you the whole story.
A few weeks ago, the display suddenly went strange - it looked like a checkerboard of hundreds of vertical and horizontal lines all over the entire display, but you could still see the distorted desktop underneath. I restarted and the problem went away.
One week ago, the same thing happened, but this time I couldn't make the problem go away no matter how many times I rebooted. I shut the computer down, restarted 24 hrs. later and the problem was gone.
Three days later, I couldn't startup the computer. It gets stuck at the grey screen with the apple and the flashing circle of dashes. Some people have described this type of issue and mentioned that the computer boots up very slowly (after 10 minutes) or that they finally get a message that says "you must restart your computer". I let it try to boot up for 35 minutes, but nothing changed. I then tried to backup my data using target disk mode, but the host computer didn't recognize the hard drive on my target computer.
I ran the Apple Hardware Test, it said that the HD appeared OK.
I ran disk utility, no repiars were needed. Ran repair disk permissions, it seemed to change LOTS of things. Reran disk repair. Says everything is okay, but underneath says that it repaired HFS volume. Reran repair disk permissions, says everything is fine, and one thing is using special permissions and lists the new permission used.
After this I was able to recognize the hard drive in target disk mode and transfer my files to another computer via firewire.
Still not able to boot up. I tried the trick of putting the computer in the freezer for 20 minutes. No difference.
I can boot up holding down option-command-O-F. The black and white screen indicates the correct time and correctly perceives that the batttery is 99% charged. I could enter a command like "eject CD" and that worked, but the command "mac-boot" did not (still gets stuck at apple screen). I also tried resetting the PRAM before I repaired the disk permissions and that didn't do anything. Not sure if it's worth doing again.
Does any one have any ideas?

Sarah:
I am not sure why your computer will not boot in Safe Mode, but it does no make me feel secure. Hold off on reformatting for a bit and let's try it again, only this time try it this way:
• Shut down the computer.
• Locate the following keys: Command, Option, P, and R. You will need to hold these keys down simultaneously later.
• Turn on the computer.
• Press and hold the Command + Option + P + R keys immediately after the startup chime.
• Hold keys down until you hear the startup chime for the third time.
• Release the keys and immediately hold down Shift key to start up in Safe Mode.
• Log in and empty Trash.
• Restart normally and log in.
It will take a while, especially if there are issues. So long as the progress wheel is turning something is going on. If there are issues that can't be resolved it will just shut down after a while. Give it fifteen or twenty minutes, anyway.
Cheers
cornelius

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