Loose connection between Mac Mini and Apple TV 2

Help!     I have a new Mac Mini 2.5 ghz running Lion and Apple TV2 hooked up to my 32 inch LG TV.
Before I got the Mac Mini, Apple TV was running just fine on the same network with my Win 7 machine.
Ever since I got the Mac Mini and I run the Apple Tv at the same time.  I loose connection on both.  My cable provider replaced the router and all my other Win 7 machines run just fine on a wireless network.  I might also add that when the apple tv and mac mini goes down, my ipad 2 goes down too.  Of course, air play doesn't work .  It comes and goes.
I have a 2nd Apple TV 2 and hooked that up to the same tv with the same results.  I have called Apple many times.  They are helpful but not been able to solve my problem.   The cable provider and I have traced down to a conflict between the Apple TV, Mac Mini and the IPAD 2 . 
Does anyone have any ideas what may be wrong?

I have had multiple ATV's, desktops, laptops, and i Devices all running at the same time without a problem. Typically on a network when you start 2 devices and the connection crashes it is an IP problem. Check the IP address on both devices and see. It is usually easiest to have the router assign IPs automatically using DHCP. The router, computers, and ATVs should also be set to DHCP.
If everything is set to DHCP try disabling DHCP and assign fixed IPs to each device.

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