Cisco 521 Radio0 Interface disabled

I configured my Cisco AP 521 using the web assistant.  however I'm unable to bring the Radio0-802.11G interface up.   I tried to go into the interface configuration an enable the interface, however I'm still seeing the interface as disabled.
Am I missing something when it comes to configure it?  attached is a picture of the interface options and a show run of the AP
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Do you have a direct power source being applied or PoE? If PoE, try a direct power source.
jazz250Author Commented:
no PoE, a direct power source is being used.
Radio not coming online is generally a power issue. If you are using the DC power adapter. You can try issusing the command:
no power inline negotiation prestandard source

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jazz250Author Commented:
Hello Chopper,
it required to configured authentication before enabling the interface, after setting a WEP key the interface appears as enabled.
thanks for your help
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