PowerMac G5 and Diamond ATI Radeon HD 2600PRO not working?

Recently bought and restored a 1.8GHz DP PCI-X PowerMac G5 off Craigslist. In the process of restoration, I decided to upgrade the original 64mb AGP card to a Diamond ATI Radeon HD 2600PRO 256MB AGP card. While ordering said card, I did not realize it required a power supply cord; fortunately, after I dug through the myriad of adapters I had, I found a SATA power to 2 molex power Y-splitter, as well as a 2 molex power to 1 graphics power Y-splitter. I plugged these into each other and ran the contraption from the 2nd HDD power supply to the card. After booting, I realized neither of the 2 monitors connected to the card were displaying video; in fact, they were in "standby" mode. The computer sounds and looks fine in terms of lights and beeps; the fan on the graphics card spins up and works fine; the keyboard and mouse light up for a second or two a few seconds after the bootup chime, and then go unresponsive. After a few minutes of staying on, the fans on the computer clearly and audibly spin faster and faster until the computer sounds like a jet engine. I attempted to allow this process to run for almost an hour the other day after reading on a forum that it's a memory test or something, but the computer was still unresponsive with no video. I've tried every kind of PRAM, SMC, etc. power reset. I replaced the onboard battery twice with brand new ones of different brands. The computer worked fine with the other card but it just doesn't want to with this one, so it seems. What are my options?

Hi David,
Isn't that only a Windows® card?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814129094
I doubt there's anyway to Flash it with Mac ROMs...
See japamacs page here on the best AGP cards for G4s & G5s...
http://www.jcsenterprises.com/Japamacs_Page/Blog/4B4B7BA2-7ABB-47F1-87AC-B03D379 42BEE.html
Rated slowest on top, fastest on bottom.

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Booting back into mac OS, I discovered that it doesn't even recognize that the card has video ram. It thought I had no video ram in the system.
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Hey Apple, can I have my 4870 display driver now?

Hi again,
It was funny to read all your answers on my iPhone while away from my computer. I could have reply on the iPhone but I preferred to wait to give you all the procedure I used to install the beta driver successfully this morning.
To start, I found this link:
http://www.insanelymac.com/forum/index.php?showtopic=155477
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I launched Aperture, got it!
I launched Final Cut Express, got it!
I launched Starry Night Pro Plus, got it! Then I checked the OpenGL settings in Starry Night Pro PLus and activated both options:
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Hello all.
I am having trouble with my Mac Pro (circa 2008) not powering up the monitor (an Apple HD Cinema Display 23 inch).
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Thanks for the info on the Expansion Slot Utility. I found it and ran it. It shows no problems. It shows the ATI Radeon X1900XT to be properly installed and running at full capacity.
I found a reliable dealer of flashed ATI Radeon 5770 cards. A couple of trusted friends have had good luck with cards from the dealer.
So I will have that on stand-by for when/if the existing card fails completely.
Thanks everyone for your input.
A

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Hello,
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PowerMac G5 and Diamond ATI Radeon HD 2600PRO not working?

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