Computer won't start, grey screen with Apple logo only. Ideas?

Last night my wife's G5 froze. It is a G5 2.0 running OS X 10.4.11. I shut it down (had to use the power button) and tried to restart. No luck, just made it to the grey screen with Apple logo and spinning wheel. After a few seconds the Apple logo disappeared and a black box took its place, then the wheel stopped spinning. It was late, decided top wait until morning before trying again.
This morning I tried to start up again. This time got a warning(?) in upper left that a Firmtek item had already started. I'm sorry I didn't write this all down at the time, so I don't remember the entire message. Since there is a Firmtek card installed in one of the PCI slots I thought that might be the problem, and I pulled the card, as well as another Adaptec card that was also installed. Tried to start again, got to grey screen with Apple but this time no spinning wheel.
Opened media slot manually and inserted Diskwarrior. Tried to start with Diskwarrior but again only reached grey screen. Let run for ~5 minutes, until fans started to run and were begining to get noisy.
Next I reset the PRAM. No luck, still stuck on grey screen. Tried Diskwarrior again, this time got another message in upper left. Here is most of it -
System Failure : cpu=1; code=60000009 (Invalid pmap)
Lateset crash info for cpu1;
Exception state (sv=0x609bb280)
PC=0x000a4ad0; MSR=0x02003000 followed by more similar strings, then
backtrace terminated - unaligned frame address; 0xfc088891
So what's the diagnosis? I've had various issues with my G5s in the past, but have never had one refuse to boot with Diskwarrior before.
Thanks in advance for any help!

Whew, could be many things, from RAM, (or RAM slots/solder issue), to CPU #1 being bad, (CPU#1 is actually the second one.
Does it boot into any of these modes?
Target mode...
http://support.apple.com/kb/HT1661
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We might get clues with verbose mode...
http://support.apple.com/kb/HT1492

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HT204347 Hi my serial number on bottom of my mac is W8*******66E when l try to try the computer on it is just going to grey screen with apple logo and spinning wheel i have tried starting in safe mode and a few other suggested solutions and they have not

Hi my serial number on bottom of my mac is W8******66E when l try to turn the computer on it is just going to grey screen with apple logo and spinning wheel i have tried starting in safe mode and a few other suggested solutions and they have not worked?
<Edited by Host>

What other solutions have you tried?
This may help you:
https://discussions.apple.com/docs/DOC-3353
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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.a. Boot into Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume (option key at startup.) Release the keys when you see a gray screen with a spinning dial. When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
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Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode.* The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

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If you want to preserve the data on the boot drive, and it's not already backed up, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data, you can skip this step.
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[Topic : kmosx: Kernel Panics? Don't panic too !|http://discussions.apple.com/thread.jspa?threadID=121923]
[X-Lab: Resolving Kernel Panics|http://www.thexlab.com/faqs/kernelpanics.html]
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Computer won't start, grey screen with Apple logo only. Ideas?

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