R9 270X HDMI fail?

Hey, I just installed my R9 270X from Sapphire and I can't see to get the any video out of the HDMI port. both of the DVI ports works, but I can't get the HDMI or the displayport with a DP to HDMI adapter.

If someone have any advice would gladly listen.
Thanks :D 

The hdmi cable?

I tested it with my Xbox with the same screen and it work on that.