Mine:
xBox (non360) + component video RCAs + ??" TV (30ish) + Z-5500 (optical)
Those 5500s are great!
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There is only one single little complaint ive ever had about the 5500s: It takes about 2 secs for it to activate after recieving digital audio via optical. So many times I can't hear quick sounds such as windows sounds, pressing buttons or the first few seconds of a song. Other than that I officially declare these are the nicest speakers I've ever listened to.
You should use the optical cable with the xbox 360 and direct cables for the computer.
Since optical sounds so much better on both, I have a splitter w/ switch. I know that isnt causing the problem because I tried it without.