EX2700 No Internet Connection

[X35pm]

My extender was working swell until this morning, but now when I connect any device I get a "No Internet Connection" error. All lights are green, I've factory re-set the extender, and I can connect to my router just fine.
I'm a borderline luddite, so any assistance would be appreciated.

[plemans]

What router do you have it connected to?  (model) 

When you're reinstalling the extender are you using wps or the installation assistant?