New Apple TV has 2 problems - internet connection and remote disk

Question

Hi,
I have a TimeCapsule as main router, connected to a wired Modem for Internet access. My PowerBook G4 connects to it wirelessly using WPA2 no problems connecting to the internet and the TC disk.
I've just added and synced my new Apple TV which has thrown up 2 problems, not sure if they're related: after copying the WPA2 password, ATV connected successfully to the network, but can't find the internet. It has a correct IP address on the network, I checked that in settings. As it can't find the internet, it can't register for my iTunes account, so can't sync protected content.
On top of that it has problems syncing items on the TC Drive: I have my main iTunes library on the PowerBook G4 hard-disc, and that part synced fine, but most of my movies and TV Shows are stored on the TC disk due to lack of space on the PB. Although they're in exactly the same format as the items on the PB, when I synced, I got an error saying the file type was not compatible with ATV, so iTunes obviously has problems syncing items on the TC although it plays them fine on the PB (well it takes a bit of time connecting, but provided the TC is turned on, it plays them fine). I don't fancy moving them one by one onto the PB, syncing, deleting, etc so I need to get that fixed.
Any idea on why either problem happens, and whether they're related?
Thanks in advance.
Nadine xxx

Answer 1

The modem is an ethernet modem connected directly to the Time Capsule, not the Powerbook.
I checked my ITunes account, it says 3 devices can play my purchased material, so that would be my PowerBook, iPod, Work PC - AppleTV missing. I need to somehow kick it into connecting to Apple's Servers and registering with them, which it obviously didn't do at the initial setup.
The Network issue seems resolved - I started playing one of the movies that wasn't syncing on the PowerBook, which started the Network Disk, the sync obviously didn't try prompting the drive to wake up. It seems to be synching those films now (which obviously takes ages, so can't check for sure until later).