My computer will NOT startup up, and nothing seems to work...

So my iBook, running 10.4.x, froze while I was typing. I did a force shutdown (holding the power key for 5 seconds). That's the last I've seen it startup. Here's what I've done so far.
After 20-someodd attempts, I finally got it to boot into single user mode. Ran fsck, drive checked out ok. Still wouldn't boot.
Won't startup in safe mode. I get stuck at the blue screen (which, incidentally, is where I always end up).
Tried booting in target disk mode (not sure why), but it wouldn't mount to my PowerMac.
Tried resetting the PRAM. Nothing.
Tried resetting the PMU. Nothing.
Tried booting to a CD. Wouldn't boot to the CD.
Always ends up at the blue screen, won't go further.
Any other ideas? Did I miss anything?

Hi, Jeremy.
You wrote: "Since I'm getting in with Safe Mode, I'm assuming it's not a hardware issue, but I did get a hard freeze while in Safe Mode, so maybe it is."1. By "hard freeze" in Safe Mode I am supposing you do not mean a kernel panic alert. Correct?
2. Your next step should be to check the hardware, as hard freezes often indicate hardware problems, such as with the logic board, and particularly in Safe Mode since no third-party kernel extensions, Startup Items, or Login Items are loaded. See my "Apple Hardware Test" FAQ for comprehensive advice on using the Apple Hardware Test in troubleshooting, including running the test in Loop Mode.
3. Troubleshooting freezes and hangs is often very similar to the process of troubleshooting kernel panics as the causes are often the same or nearly the same. See my "Resolving Kernel Panics" FAQ for a more detailed troubleshooting process you might want to apply to this problem.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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