[ubuntu] dual monitors not working

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http://ubuntuforums.org – I have tried to set up dual monitors using the provided ATI Radeon drivers as root. WhenI did, it told me that I would have to reboot and now neither of my monitors will work. It will show the normal boot screen, usually on both screens, but when it gets to the logon screen everythingis blank. I have tried unplugging one of the monitors during bootup but that didn't work. Please help. (Hardware)