How to clean up mess after ATI Catalyst Control Center and Gnome Screen resolution tool?

[Matthias Andersson]

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Hi!

I have the following problem. I wanted to try hooking up the tv and
see if I could get it to work in linux as well as in windows but then
I made a huge mistake, after setting up the resolution using ATI
Catalyst Control Center I then out of old habit set the resolution
using System-Preferences-Screen Resolution.

This rendered the screen black and now the fglrx-driver refuses to
work. I get the error on startup "Screens found but none have a usable
configuration..."

How do I clean up this mess and get fglrx working again? I've tried
re-installing fglrx and related packages but to no avail. At startup
I'm forced to choose "Run x in low-graphics mode"

Thanks in advance,
Matthias
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