ATI RADEON X1900 XT Bad resolution display with SNOW LEOPARD

Hi all!!
I just install a clean version of snow leopard 10.6.2 on my mac pro and everything works good.
Only problem I have, less resolution choice.
I am stuck with 1600x1200 60 Hz but before I was in 1600x1024 76hz.
This mac has a ATI RADEON X1900 XT graphic card.
I try on different mac pro with geforce and the resolution display is good.
It is not the problem of the graphic distorsion in top site of safari,
It's totally in the display.
Thank you!
BP

I use the same video card without any difficulty, under 10.6.2, in an older MacPro. If your card works OK in Leopard, then it's not likely to be a hardware problem. If it happens in Leopard, too, then a hardware failure is possible.
If this happened to me I'd clean the card's contacts, make sure that its supplemental power connection was tight on both ends, and re-install the card.
If the problem remained, I'd try the card in a different slot. If it persisted, I'd do a clean-install on a different drive and boot from it. If the problem recurred with a clean-installed second boot drive, then I'd suspect a hardware problem on the card or, less likely, on the logic board.
At this point I'd visually inspect the "GPU PRESENT" LED on the logic board, under the memory cage, next to PCI slot 1. As you use something completely non-conductive to press the "DIAG LED" button, which is adjacent to the diagnostic LEDs, see if the "GPU_PRESENT" LED comes on. If that LED stays off, it means the machine's EFI (extensible firmware interface) was unable to configure the graphics card, which would indicate a hardware problem on the graphics card, or possibly on the logic board. If the diagnostic LED comes on, it means EFI could configure the card. This does not necessarily mean that the card is functioning properly. The LED staying off, however, would strongly suggest some kind of a hardware problem.
If you have access to another graphics card, see if a similar problem occurs using it. Short of a thorough circuit-check in a shop, that's the only practical way to determine if it's a PCI card or logic board problem. Either way, there'd be a hardware repair/replacement on the horizon.
Message was edited by: Hominahomina

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    Hi Guys,
    I'm pretty sure my ATI Radeon X1900 XT 512 MB graphics card has failed...
    I run MacPro1,1 (2008) Dual-Core Intel Xeon with 2 x 23-inch DVI Apple Cinema Displays. Tonight only one of the screens would wake from sleep - the screen in port 2.
    I've tried...
    1. Swapping the DVI cables, this results in the non waking screen waking and the waking screen, not waking.
    2. Tried running just one screen off DVI port 1 and nothing happened, blank screen but power light on.
    3. Tried running same screen off DVI port 2 and still nothing happened, blank screen but power light on.
    To re-cap - None of the DVI ports work on their own and only Port 2 works when both screens are plugged in.
    So... is there any other tests or checks I can do to confirm 100% it's a faulty card? I've unplugged and done the SMC reset.
    Secone part to this - if the card is shot can anyone recommend an upgrade to the ATI Radeon X1900 XT 512 MB?
    Thanks
    Pete

    You could use a Mini-DisplayPort to DVI adaptor on one of the ports, I would think. Otherwise, you don't have two many choices. You might look for a used ATI 4870, Mac Edition model. It's performance will be similar to the 5770 since the 2006 MP only has PCI-e 1.0 slots so the 5770 can't take advantage of it's capabilities if installed in a PCI-e 2.0 slot.
    Other cards that will work include the older Nvidia 8800 GT for Mac. You must be sure with these other cards that you look for the ones that are compatible with a Mac Pro. These were the ones made specifically for Apple. Non-Apple cards will not work unless you have the hardware, ability, and knowledge to re-flash ROMs.

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