That's all well and good if the controller can be pinged. What is usually the case here is that there is no route to the management interface of the controller or the ap manager interface as well. Check to see if there are IP address conflicts with those two interfaces. Next, make sure that you have not exceeded the total number of APs per physical interface. If you have add a LAG group or a second ap management interface. Verify security certificates are on the APs and that the date and time on the controller is accurate. Lastly, make sure you have no PoE issues or CDP. You're beating a dea horse here guys.
