ATV2 can't find my Library

[HGH]

Why won't my Apple TV2 find my Library on my Mac mini? It finds my library on my PC. If I reboot my router, Mac mini and ATV2 then it shows up. Any ideas? I like my old apple TV much better!!

 

[Panch0]

Here are some things to check out:
1) iTunes must be open for Home Sharing to work
2) Verify that the ATV and Mac Mini are both connected to the network, and that they have compatible IP Addresses.
3) Make sure that Home Sharing is enabled
4) Make sure that the firewall on your mini is allowing iTunes to receive requests.

Since rebooting everything solves the problem, I think #1 & 2 are the only things that are really possible...