New access point can't see in zonedirector

[tariq_thoma]

5 months ago I ordered some T300 access point. In the past I can always see my new access point in ZD but from few days I can't see new access points in ZD. I don't know why. It happened with all new access points.
 
 can anyone suggest me what should I check?  

[monnat_systems]

very limited info...
see on controller -- monitor tab -- AP --- see the status of those AP's...
if they ever got connected to ZD then most probably got disconnected...
locate one of the AP's and see that status, are they pinging?, are they powered on?
what is the DIR LED status on the AP///??