"Could Not Sign In" on Apple TV I am going nuts trying to figure out how to fix this.  When I use my Apple TV for Netflix, Youtube, NHL, etc it all works just fine.  When I try to rent a movie from Apple (iTunes) it has a black screen, the message "Could Not Sign In" and an okay button and that is it.

I have full connection to my WiFi according to the my network info in the General tab.  The only answers I have found is to use a micro-HDMI cable but this appleTV doesn't have that.  It only has an Ethernet, Optical, and HDMI ports. I have not tried to hard wire it as the TV is on the other side of the house from the router and that is how I want to use it.

Anyone have any ideas before I try to use this as a skipping stone across my pond?
Use your Computer and log in in to iTunes with it.

Then just leave it logged in.

Now try again with your Apple TV.