I have an interesting, yet very frustrating problem. I have two computers, both running win7 32 bit, and both with ATI Firepro V4800 graphics cards. Both are using the DVI port and two DP to DVI adapters to connect 3 monitors.

One of them is able to display three desktops, while the other fails at enabling the third, displaying "cannot save changes" in display properties while requiring that one monitor must be disabled when making the change in CCC.

I've verified that both computers have the same driver version and that both are using the same DP-DVI adapters.

This articles suggests a few things to try, but none of its suggestions seem to work either.

I'm kind of at my wits end, hence my posting here. If this is not an appropriate question for SU, I apologize.

I admit that I am not very familiar with the differences between dual link and single link DVI, and that is something I have not verified is standardized between the two computers. Is that a possible reason one is working and the other isn't? How do I check if the DVI cable is a single link, or dual link?