7940 ip phone setting button does not work!!! :-|

Hi guys,
I bought ipphone 7940 from ebay but it is not obtainng IP from DHCP and it does not let me go into network settings manually
from the phone? What do I do? (i configured dhcp on sw3550,is it right?!)
Why setting button on 7940 is not functioning?!
:
I also have a 7960 IPphone,setting button is functioning and i set an ip address manually and also can ping it from cucm
this is my topology:
Thanks in advance
I bought ipphone 7940 from ebay but it is not obtainng IP from DHCP and it does not let me go into network settings manually
from the phone? What do I do? (i configured dhcp on sw3550,is it right?!)
Why setting button on 7940 is not functioning?!


I also have a 7960 IPphone,setting button is functioning and i set an ip address manually and also can ping it from cucm
this is my topology:
Thanks in advance
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