2 days ago I installed a newer graphics card replacing the ye olde (well not really, just low-end) Ati Radeon 9250 (128mb) which had it's drivers automatically installed - which worked fine (the drivers that is).
The newer one, an Ati Radeon 9550 (256mb) worked perfectly right after I had physically installed it; all went well - I could use Compiz and other GL applications without a flaw.
THEN (DA DDUUUHHH! :P) I booted into Windows XP (which I dual-boot with Fedora 11) and installed the correct drivers for that (Fedora automatically did so at first I'm guessing) and that worked flawlessly as well...
And now, around an hour ago I booted into Fedora 11 - was greeted with the message of "Input not supported" on the monitor - restarted the computer got the same result, restarted again this time using the VGA output(was before using the DVI port, with a DVI to VGA adapter - I was using earlier dual monitors but my brother is borrowing the other monitor(he borrowed it before I replaced the graphics card though so I don't think it's that)) it worked, only, now every now and then I get VHS-like (or the sort of artefacts you can get when filming a CRT monitor, but mine is an LCD) artefacts (like bands of black) running down the screen and I'm stuck in 1024x786 for my 1440x900 monitor (Acer AL1916W).
When trying to change the resolution in Display Settings it won't allow anything higher than 1024x786 and cannot detect the monitor (comes up with unknown).
I'm guessing it's a driver issue of some sort, because booting into Windows works perfectly without any artefacts or wrong resolution and graphics intensive things work without a problem.
So, if anyone can help me out here I'd really appreciate it, I've looked around without anything helpful.
Sorry for the n00biness also.