Help!!!!!

I have a 15" Powerbook 1.5gig. I just bought a Airport Express and the accessories started up iTunes and hooked up the airport to my home stereo
it just keep flashing yellow no solid green or anything what do I need to do?
BTW my home stereo is a Sony STR-DE845 with 5.1 surround. Do I need to configure the airport? how do I find it? I need help!!!
 

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