Ibook has trouble starting up, and when it does, it freezes immediately

Hey folks,
Last time I had problems with my ibook G4, everyone on here was extremely helpful, so I'm hoping you can help me out once more
Today I was using my computer as I usually do, and it froze, something I've never experienced. After shutting down my computer and restarting it, it wouldn't boot. The gray screen with the "thinking" wheel went fine, but when it got to the blue screen that usually has the "starting mac os x" window and progress bar, nothing happened. The window didn't pop up, and the computer was stuck on that blue screen. When I restarted, the same thing happened. I couldn't get my desktop to load.
After removing the battery for about 20 minutes and trying again, the computer got past that blue screen and loaded my desktop. However, after about 2 minutes, everything completely froze again, leaving me where I started.
Now I can get past the blue screen MAYBE 1/5 of the time after multiple restarts using control, command, power, but when it does, everything freezes. Luckily I was able to get it to work long enough to send myself important files (not a great time for this to happen considering I have a 12 page paper due tomorrow, haha) and check the S.M.A.R.T. status, which was fine and normal.
Anyone know what's going on?? Thanks!!!!!

hi there.
i can't say what the problem is but i can perhaps show you some ways to find it out.
firs thing i would do is to reset the P-Ram. shut your computer down and press "command" + "option (alt)" + "p" + "r" right after you pressed the start button and hold this combination until you hear the startup gong for tree times.
this can allready help - if not, try to boot from a system-cd. you can check the drive from system disc - do this and also check premissions.
if you have a "hardware-check" cd, you can use it to check your hardware.
post again if this doesn't help.
greetz
sepoe

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Ibook has trouble starting up, and when it does, it freezes immediately

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