[ubuntu] dual monitors not working (moved)

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http://ubuntuforums.org – I have tried to set up dual monitors using the provided ATI Radeon drivers as root. When I 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 everything is blank. I have tried unplugging one of the monitors during bootup but that didn't work. Please help. UPDATE I have tried reverting back to the built-in graphics card using the BIOS but that didn't work either. Both screens will go blank and then one of them will loose signal completely and go into st (Hardware)