IBook On, Screen Turns Black

I installed the 10.4.6 update last night and everything seemed fine. I pack up the 'book and head to class - left it on but sleeping. So when I get to class and try to wake it from sleep, nothing happened... the sleep light wasn't on either and the Apple logo on the back was dimly lit which went out. After not being able to shut down or start up (since I didn't know if the 'book was on or not), I took out the battery and plugged it in.
First time I started up, gray Apple logo then a gray blank screen... which was there for about 5 minutes. Hard shut down... start up, took a while but everything was working fine... for about five minutes. Out of nowhere the screen just went black, but I could tell the computer was still on because the display was actually luminous.
The third time I try to start up, the fan in the back starts spinning like crazy... no gray Apple logo, nothing at all appears on the screen at any time. It might be worth noting the fan that's spinning is just the one in the back, not the one on the left side.
So now I'm lost. I'm able to start up once maybe every six or seven tries. I was able to start up in safe mode, ran Disk Utility, verified the disk, checked permissions, everything seemed fine. Then eventually, after another minute or two, the same thing happened again, the screen just went black but was still on. I tried single user mode and running fsck, no problems. I started up with my login items disabled, screen turned black after 4 or 5 minutes.
I'm going to try to run firewire target mode and back up my files... but could this be a software problem since this only occurred after the 10.4.6 update... or could it be a hardware problems - in which I've never ran into any problems before... or could it be a problem with both?
iBook G4
10.4.6
768 RAM
60GB drive
DVD/CD-RW
iBook Mac OS X (10.4.6)

Thanks Jon, Lyssa - for your input.
Since I've posted last I haven't been able to make it to the gray Apple logo screen... so I'm pretty much out of luck. I can't start up from my install DVD, nor can I boot from my firewire hard drive. I'm starting to hate myself for not backing up while I had the chance... however that probably would've failed 5 minutes into the process.
I live in New York and I'd love to bring my 'book to the Soho store, however I'd have to be there at 6 AM and probably wait a long while before I can get my laptop looked at... but that's not an option since I'm a college student and I have classes to attend, and I'm not willing to shell out however much it is to become a Pro Care member if I usually don't have any issues with my Apple products. It's disappointing and frustrating considering that's where I bought my 'book in the first place.
But I digress - I'll have to go an official Apple reseller and have this checked out... after reading through a few other sites, I'm getting the feeling it's the logic board that got screwed up.
I didn't take note of the S.M.A.R.T. status, I'm kicking myself for not doing so. I've been using a new battery for about 3 weeks or so, the circles light up solid.
One question before I bring my 'book in... if there's nothing wrong with my hard drive, and some other part needs to be replaced, will my hard drive end up being wiped? I understand it's probably standard procedure after a repair to start with a clean system - however I have tons of photos which I didn't back up, which I realize now is stupid, to say the least.
If anyone has any further suggestions as to what I can do with an iBook that does nothing but run its fan... please let me know Otherwise, tomorrow I'll post what the issue was if I can get it looked at... hopefully not too many other people have experienced the same issues. Cross your fingers~!

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