When i updated to mountain lion, i can't "find screen" when iv'e plugged in the HMDI cable

Can someone please help me? Iv'e just installed the latest mountain lion and Iv'e tried to plug in a HDMI cable to connect it to a projector, but the mac can't find it! Does anybody know how? It worked just fine untill i uploaded mountain lion!!

Maybe this will help:
Video Troubleshooting Internal and External Monitors

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