Power mac G4 hangs at startup with gray screen

Hello all,
I have a Power mac G4 - mirrored drive door model. 512mb of RAM; 833mghz - about 50+ gigabytes of storage remaining.
I recently starting using this mac again, here is what happened:
Power mac G4 was running 10.2.1 - had never been updated; it also was capable of running classic os9 (even though I never used it)
Started using machine again a few weeks ago; let "software update" install 10.2.8 update - everything worked fine
Put computer into target disk mode to transfer files to my new macbook pro (13") - using firewire connection
While trying to connect (migration assistant) - window froze will calculating the amount of space that the "user" on the power mac totalled - power mac appeared to be frozen
Did a hard reset / power down of the power mac G4
Upon restart, power mac G4 goes through all start up functions up to gray screen with apple logo (with spinning wheel) and then goes to a darker gray screen (without the logo) and spinning wheel
Dark gray screen with spinning wheel hangs indefinitely - I've let it stay there for hours on end hoping it will resolve but it doesn't
Here's what I have done so far:
Placed power mac G4 into target disk mode again in conjunction with macbook pro
I can see all the files on the power mac G4 (and have already copied them to the macbook pro) - so I don't think the hard drive is damaged
Disconnected all non-apple peripheral devices - only had a card installed in the back - but took that out - issue persisted (did not replace card in back)
Removed one non-apple RAM stick - issue persisted
Replaced non-apple RAM stick and removed apple RAM stick - issue persisted
Reset PRAM
Started computer in single-user mode
used fsck and tried to have system check/fix issue; no matter how many times I re-run the command to repair it never comes back with a message saying no issues found - instead it keeps returning with a message saying that the issue was repaired "system modified"
Started computer in verbose mode
startup seems to hang when this appears:
"/System/Library/CoreServices/loginwindow.app/Contents/MacOs/loginwindow: (ipc/send) invalid destination"
"LayState: cannot map display interlocks."
"/System/Library/CoreServices/loginwindow.app/Contents/MacOs/loginwindow: kCGErrorFailure: CGSNewConnection"
"Cannot connect to server"
"/System/Library/CoreServices/loginwindow.app/Contents/MacOs/loginwindow: kCGErrorInvalidConnection"
"Connection called with invalid connection"
Tried re-installing with system discs
The only discs I received with the power mac G4 when I purchased are orange and say "SSW version 8.6" on it" ("iMac Software Restore" and "iMac Software Install")
Computer does not respond when holding down "C" key at startup with either disc in the drive
When holding down "option" key at startup, the computer shows the bootable choices as ONLY the internal HD - not either of the CDs I mentioned above; I wonder if it no longer recognizes the original CDs because I updated to 10.2.8 from 10.2.1 before the issue?
I also have an install disc for OS X 10.4.7 - for a friend's iMac (G5)
When holding down "C" key at startup with the OS X 10.4.7 in the drive I get a kernel panic
When holding down "option" key at startup, the computer shows the bootable choices as the OS X 10.4.7 in the drive AND the internal HD
When I choose the OS X 10.4.7 in the drive I get a kernel panic
When I choose the internal HD the startup hangs at the gray screen I mentioned above
At this point, I don't know what else to do. I believe the computer is still good because I can see everything on it when I put it into target disk mode; it just refuses to make it through the startup/login process. I have read discussion threads that suggest re-installing the OS using another computer - but I don't know how to do that. I also wondered if there was a way to tell the computer to re-install the software using the original CDs - but from the command line (in single-user mode)?
Someone - PLEASE HELP!

Sorry, SU Single User Mode, OF Open Firmware as these 2 where mentioned before.
As a test, let's try disconnecting the HD & see if it booys to any mode without it attached.
It could be the User's files or login messed up, if you want to try something a little more desperate...
Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/
It'll boot like a newly setup Mac, but all your stuff should still be there once filling out the stuff.
Except you could just use Target mode and move or rename that file.

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Thanks.
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Article #58418 - Power Mac G4: How to Differentiate Between Models
Article #42739 - Power Mac G4: How to Differentiate Between Models (part 2)

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Power Mac G5 Mac OS X (10.4.8)
Power Mac G5 Mac OS X (10.4.8)
Power Mac G5 Mac OS X (10.4.8)

Click on the icon on the Finder's sidebar with the house icon and then open the folder Library inside, followed by Preferences and then rename the ByHost folder inside. If the issue persists, open the Terminal application in the /Applications/Utilities/ folder and run the following:
sudo mv /private/var/root/Library/Preferences/ByHost/ /private/var/root/Library/Preferences/ByHost_old/
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(18343)

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-Douggo

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Try to completely uninstall firefox, that means to '''delete''' the [http://kb.mozillazine.org/Installation_directory#Windows Installation directory] located for your 64bit in C:\Program Files (x86)\Mozilla Firefox\ , also, '''delete''' the C:\Users\<username>\AppData\Local\Mozilla\Firefox and '''if exist''', '''delete''' the C:\Users\<username>\AppData\Local\VirtualStore\Program Files\Mozilla Firefox.
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2) Removing the USB card I put in, along with my Broadcom-equipped Belkin Wi-Fi card I put in.
3) Calling Apple and begging them to send me a copy of the AHT for the Power Mac, and with that, hopefully, a copy of the system software.
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System stats:
Power Mac G4 (FW800)
1.0GHz PowerPC G4 on a 133MHz bus
1GB PC2100 DDR SDRAM (originally had some PC3200 in the machine).
120GB Seagate HD
Stock Phillips CD-RW/DVD-ROM Combo
Pioneer DVD-111D (the nice DVD burner I cannibalized off my beautiful homebuilt Wine-doze PC)
Belkin 54g 802.11g Wi-Fi card
Masscool XWT-MTU25 USB 2.0 card
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Did both, and I still freeze up when importing iTunes songs. I'll include some kernel panic logs for reference, for you techies.
1) Thu Nov 27 22:42:50 2008
panic(cpu 0 caller 0x00260820): fg: being freed with bad fg_count (32548120)
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x00260820 0x0025E95C 0x0025E730 0x002ABDB8 0x000ABD30
0x00000000
Proceeding back via exception chain:
Exception state (sv=0x3C240780)
PC=0x90014BEC; MSR=0x0200D030; DAR=0x00424000; DSISR=0x42000000; LR=0x907C9088; R1=0xF007C240; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
2) Tue Nov 25 20:21:06 2008
Unresolved kernel trap(cpu 0): 0x600 - Alignment DAR=0x0000000002DDCC3D PC=0x00000000000A43C0
Latest crash info for cpu 0:
Exception state (sv=0x2DAF7280)
PC=0x000A43C0; MSR=0x00009030; DAR=0x02DDCC3D; DSISR=0x000000A0; LR=0x0001DEAC; R1=0x17773C10; XCP=0x00000018 (0x600 - Alignment)
Backtrace:
0x0001DE68 0x0001F47C 0x00024224 0x0002407C 0x00049878 0x00029234
0x000233F8 0x000ABEAC 0x3B2F6B65
Proceeding back via exception chain:
Exception state (sv=0x2DAF7280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2DEEF780)
PC=0x9000B348; MSR=0x0000F030; DAR=0xA0B8C068; DSISR=0x0A000000; LR=0x9000B29C; R1=0xBFFFC630; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0006): 0x600 - Alignment
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x2DAF7280)
PC=0x000A43C0; MSR=0x00009030; DAR=0x02DDCC3D; DSISR=0x000000A0; LR=0x0001DEAC; R1=0x17773C10; XCP=0x00000018 (0x600 - Alignment)
Backtrace:
0x0001DE68 0x0001F47C 0x00024224 0x0002407C 0x00049878 0x00029234
0x000233F8 0x000ABEAC 0x3B2F6B65
Exception state (sv=0x2DEEF780)
PC=0x9000B348; MSR=0x0000F030; DAR=0xA0B8C068; DSISR=0x0A000000; LR=0x9000B29C; R1=0xBFFFC630; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC

Power mac G4 hangs at startup with gray screen

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