Hmmm interesting.
Ethernet light is also on solid even after you connect it to a switch and you cannot ping the default IP address of the WAP.
The ethernet light should flash when the access point is actively sending to or receiving data from one of the devices
over the Ethernet network port. Almost like that ethernet port on the back of the WAP is stuck on (excuse the term).
Unfortunately, I cannot see any other option, but to avail yourself of the 3-year limited hardware warranty on that product.
Why not get in contact with the Small Business Support center via the following URL:;
http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html
regards Dave