Why is the PC port disabled on my Cisco 7941 VoIP phone?

I have a Cisco 7941 VoIP phone configured by CCM 7.1.5 that won't give me a data connection through the PC port.  When I look at the device config in Call Manager is shows as being enabled but when I browse to the Ethernet settings on the actual phone display it says, "Span to PC port - No".  

What other config settings may be causing this?

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"span to PC port" enables you to run a sniffer on your PC and capture all the voice conversations.
It is disabled by default.
PC Port * is enabled.
Do you have data and voice VLAN's? Is the switchport setup correctly?

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Matt VCommented:
How is the switch port setup that this phone is plugged into?  Does the phone work on a port that is already in use by another phone?
nhawkinsVAAuthor Commented:
This is an existing phone that has been in service.  It still powers on and works normally, I just can't get a data connection to the workstaion through it now.  The report I got was that my user and his manager, "swapped out the monitor and it stopped working", which makes me think it is simply hardware failure.  

I just happened to be in CCM, at the time, looking at another extension and was hoping I accidently made a change but know I didn't.
I would be suspicious of the hardware swap out on the PC. Try connecting another PC or laptop to the phone and rule that out. Then you can focus like a laser on the real problem. Physical connection from PC to phone, NIC card drivers, etc..
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