Here are my questions and thoughts that follow them.
Do you have a local router serving DHCP? The AP will look for an address before going with the default IP. If you have one and access to it, look for your AP MAC address in lease table.
Good to wait for the AP to go full green on the PWR LED before trying to find it. If you only connect PC/AP to a PoE port for access, have you pre-configured your PC to a 192.168.0.x (other than .1) IP address; or, does your PC pull an IP from your network if you connect thru the R300 ethernet Pass-Through or LAN/Uplink ports?
I was finally able to access the AP. I did as you suggested and connected to my switch and gathered the IP address of the AP from the table. I was able to login using the switch assigned IP address with the default user and password. I upgraded the firmware and configured the AP. I am logged into the AP now and browsing. Thanks for the help. Keep up the great advice.