I have a 2007 XK and used the hidden menu to see if there would be a function to help me pair my phone. I pushed something and now my navigation wont respond any suggestion??

 

Try a Hard Reset. Disconnect both battery terminals from the battery and touch the cables together for a few seconds. Do NOT touch either cable to the battery at ANY time during the touch of cables or you will die and burn your car down.
This will reset all the volatile memory in the modules. You may have to reset the window travel (do it anyway) but your seats and vehicle settings (radio also) will remain.
That's the first step, anyway. If it doesn't work, try whatever people below say.

 

What do you mean by not responding, touch screen totally dead or nothing appears on the screen when you select navigation or something else?

A screen shot or two would be useful.

 

Thanks, I tried the LOCK THE DOOR for 10 minutes and it worked reset the system

 

So the original issue (pairing your phone) was resolved too?