I recently made a mistake in attempting to edit Sudoers; so I decided to reinstall Ubuntu 11.04.
When booting into Ubuntu now an error message displays on the Dell 1708FB-BLK monitor: "The current input timing is not supported by this monitor." I'm using the VGA receptacle on this monitor.
I opened ATI Catalyst Control Center and clicked on Monitor 1; but it has 75HZ refresh rate which disagrees with the 60HZ refresh rate elsewhere at Control Center>Monitors and it doesn't allow changes.
I reinstalled the proprietary FGLRX driver and the ATI Catalyst Control Center without any change. Also ran Command: 'xrandr --output DFP1 --Mode 1280x1024 --rate 60; but there was no change.
I'd appreciate any help

I opened System>Administration>Additional Drivers and removed FLGX Proprietary Driver
and rebooted. The error message no longer pops-up. Guess I will have to see if there is a
better Proprietary Driver or an ATI Radeon 4200 Driver for Linux.
Not sure if this problem is really solved yet.

After doing some research, found that I am not the only one with ATI Radeon HD 4200 FLGRX Proprietary Driver Problems.
BTW ATI Catalyst Control Center comes with FLGRX.
I found this: https://wiki.ubuntu.com/X/Troublesho...thRadeonDriver
Hope this helps others with this problem