No DHCP on Cisce Catalyst Express 500 Series

I just inherited a pair of Cisco Catalyst Express 500 series switches.  When I try to hook a computer up to it, I am unable to pull an IP address from our DHCP server.  If I set the computer up with a static IP, it works just fine.  I'm not terribly familiar with this family of switches, so I'm not sure what could be causing the problem.   Does anyone have any ideas?

I also need to know the default IP address for these switches (from the research I've done you have to configure them through a web interface).

Thanks in advance!
MasterComputingAsked:
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SouljaConnect With a Mentor Commented:
You may have to reset the switch back to default.

http://www.cisco.com/en/US/products/ps6545/products_tech_note09186a0080707fb0.shtml

Otherwise you can see if it's possibly in your router's arp table. Run a ping scan on your entire subnet and maybe the switches' ip might populate the arp table.
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SouljaConnect With a Mentor Commented:
As for the dhcp issue. The only thing I can think of preventing that is if there is a vlan created on the switch that you are plugging into that the dhcp server is not part of. You won't be able to verify this until you log into the switch.
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