If the LED is orange you are not getting an IP or you are getting an IP and it's not getting out to the Meraki cloud. check the physical layer and dhcp logs..   You saying it works in mesh mode points to the physical cable or ports being faulty. I have seen APs power up with bad cables that kill data but will still supply PoE..... Also its Cisco Meraki, if you have a license RMA the device.  ... View more