HDMI output not working MACBOOK Pro (Oct 2014)

I am trying to get another screen connected to my MBP, I have tried numerous screens and cables to achieve this, but I can not get it to work.
Is there a on/off or disable HDMI output on the MBP?
I have used various screen, which i know work. And a HDMI to DVI and HDMI to HDMI cables to screens . I know the cable and screens work as I use them at work on a daily basis.
All I get is "No signal connected".
Is there any diagnostics or tests I can do?
Regards,
Rowland

I have a 13" MacBook Pro.

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