Connecting HDMI to LCD Problem

Dear Users,
I am having dell inspiron 5521 with radeon 7670 graphics card. I am not able to connect my laptop to LCD,Projector. I tried various cables and connectors but all in vain. I even upgraded all the software still i cannot connect my laptop to any of external source.
Your help would be highly appreciated.
regards,
KAmal

You need to select the external monitor by pressing the appropriate Function key (should be the one that has a picture of two screens on it) after you connect the monitor. Also make sure the video control panel showsd two monitors are present.

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