Xbox – Why does this bed work for me but not for someone else

I just checked my adapter, the light is amber when the system is powered off and green when on.

I've noticed that the 360 won't boot up unless the HDMI finishes a handshake with the TV first. Can you try with a different HDMI cable or with an RCA or Component Video and see if that has the same effect?

I also have a 120GB Elite.

Update: I've traded up for a 320GB Slim, it is the same situation. It will not boot until the HDMI handshake finishes.

My husband and I do this very thing, so yes it works.

To clarify and restate, I bought one copy of the game and used the online code for my gamertag. My husband bought an online code for 800 MS Points ($10) with his gamertag.

I use one of the game's discs and he uses the other. We play multiplayer with no issues whatsoever.

You have to purchase the extra online code by booting up the game with a gamertag that doesn't currently have the multiplayer unlocked. Select multiplayer and follow the onscreen instructions there. You can't buy it from Xbox.com or anything like that.