[ubuntu] Help a new guy out (ATI Driver)

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http://ubuntuforums.org – So after working with linux servers for the last couple of months I've decided to make the switch from windows. My problem is that my GPU fan is extremely load. My GPU is an ATI Radeon HD 6870. Also when i go into details, under graphics it says unknown. I went into software sources and changed to a proprietary driver. The noise of than fan is normal however the side and top menu bar have disappeared and also any movement of a GUI is extremely slow. If someone could point me in the right direction I'd be for ever thankful! (Hardware)