I have 3 Ruckus R510 APs and one of them stopped working. I have tried powering down and restarting the Ruckus System, but, only 2 of th APs powered up while 3rd did not. I tried disconnecting the ethernet cable and plugging into a different port on switch, but, that AP still did not power up. I removed the AP from the ceiling and tried connecting it to the switch with a brand new ethernet cable that i know works (as i tried it on other devices as well), but, the AP did not power up. What other steps do I need to take?