Deleted System Fonts - OS X Won't Boot.

Hi everyone,
Firstly, I sincerely apologise if this topic has been brought up in the past. I've browsed around and couldn't find anything relevant.
Today I did somethnig very stupid. In an attempt to organise my fonts, I copied the fonts from the [Library/Fonts] Folder (not the user one, but the one in the system folder) and promptly trashed the originals. Then, I restarted the iBook...
Everything starts up normally, until it gets to the progress bar loader where none of the loading text is visible (The: Initialising Network, blah blah, stuff...), then it goes to the black Darwin screen asking for the username and password, which I enter but it only allows me access to the command line.
I have attempted to boot from the Original DVD by holding C on start-up, but it doesn't seem to make any difference. Anything else I could try?
Luckily, I had backed up everything a few days ago, so I'd be happy even with a clean install, but, at the moment, I can't even do that.
Thanks for any help in advance.
iBook G4 1Ghz Mac OS X (10.3.9) 256MB, 40Gb

Hi Egor,
In addition to Kappy's advice, read my FAQ on fonts and OS X. If you did indeed empty the System>Library>Fonts folder, then the reason your Mac won't boot is because you deleted the LucidaGrande.dfont. That's the one font OS X can't do without. Towards the end of my FAQ, there's a section called "Font 911". That gives you a few methods to get that font back on your Mac, eliminating the need to format the hard drive and reinstall everything.
As far as not booting to the DVD, that may just be a matter of timing. If you're a little too slow, the Mac will try to boot to the hard drive. Turn the Mac on, and immediately press the C key and hold it down. If you've been pressing and releasing, that doesn't work. You need to hold the key until it's plain that you've started up to the DVD.

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Deleted System Fonts - OS X Won't Boot.

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