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HDMI is not working after installing AMD Catalyst Control Center.

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http://www.linuxquestions.org – I am running Ubuntu precise (12.04), 3.5.0 kernel and HDMI video output was working fine until I installed a dual monitor set-up and upgraded my video drivers by installing AMD Catalyst Control Center. Now my HDMI no longer works, the TV recognizes it but there is no video signal going through to the TV. Does anyone know what could be causing this? (HowTos)