Widescreen Gaming Forum

I'll start downloading a live disc, but given that it doesn't work at the BIOS/POST stage, I don't think that it'll make any difference at this point. :(

The other thing is that these are actually replacement 5770s as alluded to in my OP. I had regular HIS 5770s, but after talking with HIS, they had me update the video BIOS on both cards, and then subsequently RMA them for different 5770s which are slightly overclocked, non-reference coolers, etc. The PCBs are probably nearly identical, though, the more I think about it. Don't have any other modern AMD/ATI cards to test with, unfortunately. :(

Have you tried this?

While in Windows with the computer running, try unplugging the DisplayPort monitor (leave in any USB connection if the adapter has it, just unplug the DisplayPort connector) and plug it back in again while it's all running.

My setup had exactly that problem of calling the monitor a generic pnp monitor with a terribly low resolution, and Eyefinity groups wouldn't work. Doing this above 'hot' while everything is running (I had the CCC and Screen Resolution pages open to see what was going on at the time) was the only way I could get it to work.

If that doesn't work, I would uninstall the drivers, run Driver Sweeper, then install the latest 11.12 again, then try unplugging and replugging if still required.

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Its not unpresedented that a screen doesn't show post, but works after windows is loaded. As I mentioned, people with Nvidia 570/580 cards with DP had this issue with S27A750D and S23A750D screens, and some Apple ACD screens with AMD 9700 and 9800 pro (I think it was) had this issue too but with DVI at that time.

Worth checking out if you have the time. I think its a hardware issue, but these distro's work with DP, so they can reveal a software issue if present.

Edit: Try the hotplugging Aussie suggested first. Thats a good idea I forgot about. :)

Tried hotplugging in Windows, ran driver sweeper, reinstalled 11.12s, hotplugging again, linux mint off of a usb stick. No dice. Linux Mint saw the adapter but didn't seem to be getting the monitor's EDID from it, just like Windows.

Anyone have any suggestions? I haven't had any success or ideas aside from replacing the video cards again..