G4 has blue screen and I still can't get it to login...HELP!

Question

I went to the store and when I returned I had a blue screen with my mouse pointer that could move. I read tons of post on here and tried everything such as resetting PRAM, bought a new battery because like threads said, I too would push the power button and it would flicker and not turn on. I would have to unplug the power cord just to be able to get another try. If I didn't, nothing happened. So then I borrowed my Aunt's Leopard CD she had from her iMac and tried booting off it (holding down the C button) and nothing. I get a message stating that I can't boot off of that disc? After letting it sit for a few hours I was finally able to get past the blue screen and access Disk Utility. I tried repairing the disc (i have 3 plus the backup drive) and I get past that. I then select Verify Disk Permissions and get a "FIRST AID FAILED" Message saying Disk Utility stopped repairing permissions on "HD" because the following error was encountered. The underlying task reported failure on exit. So then I run across a thread saying that it could possibly be a admin user or password problem. I remember just before the blue screen that I was indeed researching on how to lock a folder on my desktop as well as my back up drive. So I followed the instructions and powered it on while holding the apple key + S key and typed in mount -uw /
rm /car/db/.AppleSetupDone
shutdown -h now
Now when I turn it on it starts up just like its brand new. However, I can't get past the part where it ask if I want to transfer information from another computer or Hard Drive or do it later with Migration Assistant. I have tried starting it and holding down the C key and nothing happens - I get the gray Apple screen frozen. I have held down the Option Key and restarted and selected both the HD and Start Up Disk which both have a little blue X in the corner if that helps and same results. Before trying to start up using the disc i forgot to mention I tried restarting it pulling each of the RAM drives out and putting them in different locations and that did nothing. And FINALLY! The last restart prior to posting this I have a bunch of lines across the Purple Galaxy Screen that says:
System Failure: cup=0; code=00000001 (Corrupt Stack).
Latest crash info for cpu 0:
Exception state (sv0x29d85280)
Backtrace terminated - frame not mapped or invalid:
Any ideas from here?

Answer 1

Whoah boy, lots of things here and I have to make supper...
I'll choose a few at a time. "RAM drives"
RAM drives? Do you mean hard drives? Do you mean RAM chips?
If hard drives, did you put them back in the same order? Multiple hard drives in one machine often need to be jumpered correctly when you move them about.
If chips... It's too difficult at this stage to tell if it is hardware or software. If hardware it could be chips, and that error at the end had a vague chip ring to it. One way to test for chips if you have extra chips is to pull all but the minimum required to boot and see if it boots.
You mention a backup drive. This wouldn't happen to have a clone of the operating system on it would it?
4 drives... All internal?
From all you've said it could be hardware or software. Blue screen could be software but failing hardware can corrupt a drive, messing up the software.
Boot discs. It sounds like you have no boot discs (CD. DVD) for this computer, right?
What computer are you using right now?