ATV joins network but can't negotiate internet connection?

Hi, I've just upgraded to 10.6 and also switched my airport network to 'n' only. All worked a dream except for my ATV. It connects to the wireless network but can't obtain a router address or dns address so has no internet connection?? The ATV has been working beautifully over a B/G network for months so I don't know if it's the move to n or the move to 10.6 or both.
Any advice available on this? I can't seem to find the issue discussed on the forum already.

Try restarting the DHCP server.
Now that you've updated to SL have you tried putting your network settings back to your b/g setting to try to isolate the problem.
You didn't turn off bridging when you set your router to n only did you.
Is your router set to n only or b/g/n or g/n

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