Dual Display on Early 2005 Powermac G5 - Second DVI Port bad?

Hi
I've just bought a second display for my Powermac and can't get it to work. Monitors OSD says no DVI signal and i get a blank screen on second display. Main display is still fine.
System Profiler recognises that second monitor is attached and SysPref/Displays thinks that there are two monitors attached.
Monitor & cable definitley good as they work when I swap them round.
Monitors are Sony SDM-S75D & S74. Graphics card is an ATI Radeon 9600.
I've not used the second DVI port since I bought the Mac new a two years ago, so it may never have been good.
I've tried:
Known good tft display
Known good dvi cable
Reseat cables
PMU reset
NVRAM reset
Open firmware reset-all
Checked for updated drivers.
Before I look at buying a new graphics card, is there anything I haven't tried yet?
Cheers
Gareth

OK, this is odd.
In desperation after finding out the price of a new graphics card;
my sony tfts are dual input dvi and vga. so i dug out the dvi to vga connector that came with the mac. Now running the second monitor via dvi to vga converter and its ok. not as sharp an image as the dvi main monitor, but ok. will still have to buy a new graphics card sometime.
So dvi to vga works on 2nd port, but not dvi to dvi!!

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Please click the white KUDOS star to show your appreciation
Frank
{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
This is a user supported forum. I am a volunteer and I don't work for HP.
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http://www.macmall.com/macmall/shop/detail~dpno~7362892.asp
http://www.macmall.com/macmall/shop/detail~dpno~398568.asp
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Dual Display on Early 2005 Powermac G5 - Second DVI Port bad?

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