Resolve Remote Conflicts with Media Center and Extenders (Including Xbox 360)

If the green button on your Media Center remote is turning on your Xbox 360 then try this setting to disable the green button interference on your Xbox 360: (via The Green Button)

I had this too. In the XBox 360, go to System blade, Console Settings, Remote Control. Set this to Xbox Media Remote. Then, the green button shouldn't turn it on anymore.

And you can also use TweakMCE to set the remote control ID numbers for all of your Media Center and Media Center extender remotes so your Media Center PC listens to only one remote. I had this problem when I had an extender close to my Media Center PC so this is a great tip to know.

with tweakmce you can also set mce to listen to a remote number (and program the mce remote to the same number). allows up to 9 different mce systems to be within ir range and not control each other. However this is somewhat limited on extenders (aka missing) but I don't use a 360 so it might also be an option.