X1 Carbon mini Displayport won't connect toHDMI

Hi I have an X1 carbon type 3443 thinkpadand while the mini displayport will now connect via a VGA adapter without intermittently going to a black screen following updating the BIOS with the Dec 2013 update, it will not connect to a HDMI screen at all. Windows 8.1 64bit 
The external HDMI screen is not shown in Control Panel/Display/Screen Resolution and Fn F7 goes nowhere.
Any ideas on what I should try next before asking for a refund?

Hi BenZion,
Welcome to Lenovo Community!
As per the query we understood that you are facing the issue with Display port on your ThinkPad X1 Carbon.
Have you checked with updating Graphic drivers and BIOS update?
If you have any difficulty in finding the drivers, please share the MTM number & OS (Operating System) of your device so that I can assist you with the drivers.
Hope this helps!
Best regards
Hemanth Kumar.B
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