##- Thanks for responding.When I replaced the IEEE pde AP with new on same cable; new AP bootedsuccessfully and visible on WLC,So there is no possibility of cable fault ..Atleast in my case.Just to mention, we are facing this on multiple APs and last...

I am also facing the exact same issue; we are using cisco 4800 WAP, I also tried to take console of the WAP;in my case, I found out that WAP continuously reboots and never up stable. I am still searching for the right solution; if anybody has any ide...

Thanks for the valuable information