Powerbook won't turn on past 'uploading OS X' screen.

Hey there, looking desperately for help!
Yesterday I had issues with my computer: it shut down a program I was working on, and wouldn't let me reopen it. I wound up restarting it. Or trying to. When I restarted it, it never went past the blue 'Starting Mac OS X' display, even once the upload bar was full. I've left it to restart for HOURS, but it still doesn't go beyond the OS display.
I've already tried the NVRM and PVRM trick in the troubleshooting, and don't want to risk the PVM trick just yet.
Anyone have ANY clue why it's doing this/how to fix it?

Sounds okay in theory, but wouldn't I need my computer to be ON for this to work?
Insert the disc, press the power button, then hold down the C key after the startup chime and your machine will boot from the DVD. Choose English, then go to the Utilities menu in the menu bar and choose Disk Utility and run your tests and repairs from there. When you're finished, quit DU and the Installer and restart.

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Hello,
I'm a student studying abroad right now in Senegal, part of Sub-saharan Africa (which might help for later on).
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Hi, Chris. Welcome to Apple Discussions.
It sounds like you may be having logic board problems. Enough Dual USB G3 iBooks suffered from this problem that Apple began the iBook Logic Board Repair Extension Program in January of 2004. Check out the FAQ page and if the symptoms look familiar, give Apple a call.
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John Sawyer
CJS Macintosh Repair
Instructions for removing the lower case:
http://www.ifixit.com/Guide/50.5.0.html
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Hi,
I've just replaced the hard drive in my 12" G4 Powerbook (640mb RAM with SuperDrive) after a complete drive failure. It took some time to but the procedure I found was thorough and I took my time. Turned it on and got the Apple folder icon. Nice. Thought that it had gone back together AOK at this stage. Then I went to install leopard on the new drive. I powered it off and then on again and inserted the DVD expecting to be able to run through the installer. This is where I'm having problems.
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Hello and Welcome to Apple Discussions ...
HI Don,
To eject a disc using firmware:
Restart the computer.
When you hear the startup sound, press and hold the Command-Option-O-F keys. (The Command key has an Apple on it.)
Release the keys when you see a white welcome screen.
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A lot of forums I've read said to put it into dfu mode or "connect to iTunes" to restore b
You want it in recovery mode, not DFU, which is used for hacking or on already hacked phones
What is Difference Between Recovery Mode and DFU Mode
Error 21 usually means there is hardware damage,
Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the error message when you update or restore, contact Apple support.
Please apple fix,
Who are you talking to? This is a user-to-user support forum, not Apple.

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- Connect the iPod to your computer and try to make a backup
iOS: How to back up and restore your content
- Next reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
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Powerbook won't turn on past 'uploading OS X' screen.

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