Mac Pro 1,1 freezes on boot screen, hard drives are accessible via network

My Mac Pro 1,1 today failed to display anything on the monitors when I woke it from sleep mode, even though it sounded like it was running.
Upon restarting the computer, it chimed as usual, made fan and hard drive spinning sounds, and went to the boot screen, where the little grey, dashed circle went around for a little while, but then it froze.
The hard drives kept making noises, so I waited, but nothing happened.
So I tried the following things;
• Restarted
• Zapped PRAM
• Unplugged USB devices
• Disconnected power cable for over 15 seconds
• Pushed PMU reset button
• Tried to boot from Snow Leopard DVD
• Pushed on graphics cards and RAM risers to make sure they were seated
• Looked inside computer to see if anything looked out of place (nothing really)
• Smacked side
Nothing helped.
Even when I tried to boot from the Snow Leopard DVD, it did the exact same thing; showed the boot screen, spun a little, froze.
I got on my MacBook Pro and was able to access the hard drives over my WiFi network, so I know the computer is running on some level.
This computer has been running slowly for awhile, which I attributed to running out of disk space and having lots of browser windows open, and I think it had a couple of kernel panics recently. Also the monitors went haywire a couple of weeks ago after I shut the computer down while it was running on UPS power, but I was able to fix one by doing a factory reset. I don't know if any of that is related to this problem.
Also, I currently have both the factory graphics card and a more powerful graphics card for GPGPU simultaneously installed (forget the model number, but it's the one that dies and you have to bake it to make it work again). It's not glitching up at all though; just spinning a little on the boot screen and freezing. I tried unplugging one of the monitors from the graphics card I had it connected to and plugging it into the other one, but it didn't make any difference.
I also recently ran disk first aid on all my hard drives and it said they were fine.
Any ideas???
Anyone have any ideas?

The Boot screens use a very simple mode of display, typically shared by Safe Mode, Alt/Option boot, Recovery mode and stand-alone Installer. Once you get to the login screen, the Driver loads and the most complex interrupt-driven parts of your graphics card must be working to display a picture.
The cards in older Mac Pros do not have a history of long, trouble-free life. There are many, many threads here that are solved by replacing the card, especially with a more modern one.
User Tip: Mac Pro silver tower (2006-2012) Replacement Graphics cards

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First check that you still can't boot as usual. If you can't, see below.
Please read this whole message before doing anything.
This procedure is a diagnostic test. It changes nothing, and therefore will not, in itself, solve your problem.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The procedure will help identify which such modifications you've installed, as well as certain other aspects of the configuration that may have a bearing on the problem. Don’t be alarmed by the apparent complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode, if possible. If you’re now running in safe mode, reboot as usual before continuing. If you can only boot in safe mode, you can still use this procedure, but not all of it will work. Be sure to mention that in your reply, if you haven't already done so.
Below are instructions to enter UNIX shell commands. The commands are safe and do nothing but produce human-readable text output, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects. I am not asking you to trust me. If you can't satisfy yourself that these instructions are safe, don't follow them.
The commands will line-wrap or scroll in your browser, but each one is really just a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. Step 1 should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click anywhere in the line of text below on this page to select it:
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Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
The command may take up to a few minutes to run, depending on how many files you have and the speed of the computer. A TextEdit window will open with the output. Post the contents of the TextEdit window (not the Terminal window) — the text, please, not a screenshot. You can then close the TextEdit window. The title of the window doesn't matter, and you don't need to post that. No typing is involved in this step.
Step 2
Remember that you must be logged in as an administrator for this step. Do as in Step 1 with this line:
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To prevent confusion, I'll repeat: When you type your password in the Terminal window, you won't see what you're typing.
Note: If you don’t have a login password, set one before taking Step 2. If that’s not possible, skip the step.
Important: If any personal information, such as your name or email address, appears in the output of these commands, anonymize it before posting. Usually that won't be necessary.
Remember, Steps 1 and 2 are all copy-and-paste — no typing, except your password. Also remember to post the output as text, not as a screenshot.
Please post the contents of the TextEdit window, not the Terminal window.

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once it gets to the point where it loads an OS X system, it stops at the black screen as if something isn't working right.
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Thank you for your reply,
Pull all the drives you have other than the one that you will install Windows 7 to.
I think I will try this next.
Don't put Windows 7 on the same drive as OS X, give it its own.
That was initially what I started out doing.
And you don't even need Boot Camp Assistant.
True, but it's what Apple suggests using.
Might also want to try moving the monitor cable to the other card port.
Hmm, I think I'll try that.
Any other PCI cards or devices attached or installed should also be questioned or disconnected.
I've disconnected everything I could.
Always a good idea to start fresh which I assume you are doing (not trying to upgrade over RC etc).
Yes, the drive was empty to start with.
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- Loaded Windows 7 Install disc into my room mate's windows PC... loaded up fine, got to install screen
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It does recognize that I have a Windows 7 install disc inserted when I use the boot selector/startup disk chooser.
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The video card fan whirls around for about 5 seconds and clicks off.
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Take it back to the repairer for another $75 or buy some more ram and see what happens.
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High quality while inexpensive work perfectly. 4% hit (but then use 8 DIMMs and you get 17% boost too).
2x2GB FBDIMM DDR2 667MHz @ $35http://www.amazon.com/BUFFERED-PC2-5300-FB-DIMM-APPLE-Memory/dp/B002ORUUAC/

I cannot get my Mac Pro (Original) MacPro1,1 to boot with the 64 Bit kernel in 10.6.8

I cannot get my Mac Pro (Original) MacPro1,1 to boot with the 64 Bit kernel in 10.6.8 (this is a 2 x 3Dual-Core Intel Xeon machine).
Firmware = MP11.005C.B08 (EFI 1.2) 1.7f10 (SMC 1.1)
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Should I bother?
It won't boot with the Key 6 & 4 method.
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Because it can't and doesn't have a 64-bit supported firmware.
UEFI (EFI64) was not finalized and adopted until very late 2007 and introduced in 2008, by Apple, Intel, other members of EFI Group and Unified EFI. The Mac Pro Mid-2010 was the first time though that 64-bit mode was the default.
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Also can't boot Windows 7 64-bit DVD to install properly. But you can run Windows 64-bit kernel because you have a 64-bit Xeon.
Macs that use 64-bit kernel
64-bit kernel mode Snow Leopard
Booting with 32-bit or 64-bit kernel
Mac OS X- 64-bit kernel questions
http://macperformanceguide.com/SnowLeopard-64bit.html

Mac Pro 1,1 freezes on boot screen, hard drives are accessible via network

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