Home Sharing Apple TV 2 No Video

I recentley moved, and before the move I was able to stream all my movies from my external hard drive through an iMac to all of our devices. (4 Apple TVs, 6 iOS devices)

i didn't change anything on my computer, or router, but when I plugged it all in at the new house, only my audio will play on my Apple tvs. I assumed I had done something wrong, but everything still works perfectly on all of our iOS devices.

I'm confused on where to go from here.