I've been having a very weird problem recently.
I have a 4850 and it works with all operating systems. (XP/Win7/Ubuntu)
But recently when i disconnected (accidentally) one of my monitors in dual screen mode (in ubuntu). That particular monitor does not get any input on startup in ubuntu no matter what i try. (i've even reinstalled the OS a few times)
When I mean no input, I mean the monitor doesn't get any signal. So basically.

- The monitor doesn't get input when ubuntu loads the GDM (But can be sorted by pressing CTRL+ALT+F1 and then CTRL+ALT+F7 again, then everything works perfect! Until a GDM restart/reboot)
- The monitor receives input in all other operating systems apart from ubuntu.
- Output works with another monitor
- Monitor definitely works!
- Seems to be doing the same thing regardless of Ubuntu version or catalyst version. (I've reinstalled everything 3 times, with different ubuntu versions paired with different catalyst versions.

Any help would be greatly appreciated! =D
Maybe i should draw a picture if the above is too confusing