My Belkin adapter won't connect to the Internet

I bought one set of belkin powerline internet adapters to connect my blue ray for netflix and it was working great, I disconnected the one attached to my blue ray to try it in my mom's blue ray and worked great....Now it doesn't work on either....i was on the phone with Belkin for hours....
Anybody know what could be wrong?
I would appreciate some help before I return it....
 
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