Can see ATV on one Mac, but not another in a network..

Linksys 4 port router, Wap54G wireless, Mac Pro 10.4.9 wired to the router, MacBook Pro Wireless, ATV connected via wireless, 10.4.9
MacPro Itunes 7.1.1 (5) will not show the ATV period in devices. I go to my macbook pro, fire up ITunes 7.1.1 (5), connect via wireless, ATV shows up ready to be configured.
Both machines: firewall not on, check for appletv checked in both ITunes. ITunes on MacBook is "virgin", eg not associated with an ipod, just 4 little things in the library and not an authorized computer. MacPro libary well used, photos, audiobooks, videos, podcasts, purchased music, etc, eg a normal itunes world, authorized machine.
No internet sharing on either machine. MacPro has Windows sharing turned on. Other difference is that one is connecting to the net via wireless (Macbook PRO), the other one is wired, but just doesn't feel like this is the issue, but am stuck chasing it further. Ideas?

Hi Techweenie,
Okay if the Mac Pro cannot see the Apple TV, and it is not listed in the sources menu of the Apple TV. You might try going to the sharing preferences on the Mac Pro and turn on internet sharing from the one ethernet port to the other, and then plug an ethernet cable into the Apple TV. The Apple TV should show in iTunes (assuming we have iTunes 7.1.1 in stalled). If it works and the firewalls are not on in the Mac Pro, then I would say it must be being blocked by the router.
If you do have both computers listed in the sources of the Apple TV, then it would seem that the MacBook Pro is synced and the Mac Pro is set for streaming.
Regards,
John

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