dual GPU quardro card not recognizing 2nd GPU

*sigh* im not a hardware guy like i was 10 years ago, and so far google is turning nothing up, even from the nvidia forums. hopefully someone here can help me find my direction.

Dell Optiplex 960, nVidia Quadro NVS 420, 3 Dell 19" flatpanels. card has this HD-SCSI looking port on it, with this dongle that connects to it, with 2 ends, each with 2 DVI ports (4 DVI ports total). Running Fedora 12 or 13.

last friday after an update, i came in monday morning to screen #3 flickering, and mouse couldnt move into that screen area. i figured just needed to restart X after the last update (since i didnt yet reboot). nope, that was the last time id see the 3rd screen operating under linux.

backtracked/reinstalled 12 or 13 several times. either latest kernel and all updates, or no updates and default kernel, with nvidia driver that matches the kernel, and still nothing. still only shows GPU0 when i open the nvidia-config-display app.

i started to open a ticket with PNY over this issue, but balked when i installed windows 7 on this same box, and all 3 monitors came up with the default driver. (and 2 GPUs shown in device manager).

i have no idea where to go from here, im running out of steam with this issue! if anyone has any ideas where i might go next with this issue, please let me know!

Sounds like your last update did something to change the display driver for that video card. Obviously it works under Windows 7, so the issue has to be with Fedora update and/or a driver change. Does Fedora offer restore points like Windows 7? Sometimes that works for me. Or if you had an IMAGE of your system saved when the video card was working, you could try retoring that as well.

well i was on fedora 13, and it was an update to 13. but even backing down to 12, or the default install of 13 isnt getting back up and running.

I agree about the update messing with the driver, but don't which it would be exactly. Could be X, nvidia's driver, who knows. If rolling all of those back doesn't work, you could try reformatting your Fedora partition. That is assuming, however, that your /home and other data directories are mostly separate from the os install. Either it would still be a pain to reformat the partition.

Best of luck