Screen stays black when I turn my iBook on, no response. HELP

I really hope someone can help me with this cause the laptop in question belongs to someone else and I'll be in a tough spot if I don't fix this...
So I've been borrowing this G4 iBook. I've installed some software, including some "whois" programs from the internet. I've also been downloading torrents via Transmission. Anyway, this is what happened:
I was downloading a torrent, and I had Safari open. I began to transfer a movie to the Apple-TV system I have when things started running slowly--so I went to the energy savings panel and optimized the processor for highest performance. Things kept running slowly so I began to quit programs. Finally I had only the Apple-TV transfer open but the Finder wasn't responding (rainbow wheel).
I tried to relaunch the Finder by force-quitting but no response. I then tried to restart, no response. So finally I held down the power button to shut the computer off. Now when I turn it on I hear the start up sound but the screen remains black. I think the keys are unresponsive too cause I tried pressing the power button and pressing 'return' to see if it would restart or shutdown. Nothing. I mentioned that I've been downloading some software and torrents for the off-chance that I have a virus. I have a Norton Antivirus CD if I need it. I don't know what to do though.
I'd really appreciate some help here. It would save me the embarrassment of having to take the laptop to get repaired.

Very Important, how much Free Space is on your Hard Drive first of all? Click on the Macintosh HD on the Desktop, then do a Get Info on it.
See if this works...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

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Screen stays black when I turn my iBook on, no response. HELP

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