By any chance do you have any ethernet cable plugged in??
If the answer is yes, unplug it. Notice that you need a power block if you intend to use wireless
Checklist for Installing the Cisco Unified IP Phone 8961, 9951, and 9971
http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/9971_9951_8961/8_0/english/admin/guide/9971ovr.html#wp1090248
Choose the power source for the phone:
•
Power over Ethernet (PoE)
•
External power supply
Determines how the phone receives power.
Note
The Cisco Unified IP Phone 9971, when being used in a WLAN environment, requires an external power supply.
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate