Mac Mini mid2011 will not stream video to my ATV3 only sound..?

Hi Guys

I have searched the net for a few days to find a solution to my problem, but havent found anything yet?? Streaming using Airplay in Maverick 10.9.2 just wont work, only sound is streamed. The wifi router is placed about 3meters from the macmini and 10cm from the ATV3, so signal shouldnt be an issue.

However streaming from my Iphone4 to the ATV3 works just great,?

Btw when i click mirror in the Airplay menubar nothing happens, it wont select it.

Does anyone have any suggetions to solve this issue.

Kind Regards

Outherod