if it is under hardware warranty, and you cannot get into it at all. It is possible the unit has failed, and there's not much that can be done about it. go to the Cisco site, hover over support --> open or view cases, create a case there, then call in with an existing case. phone numbers here
http://www.cisco.com/c/en/us/support/web/tsd-cisco-small-business-support-center-contacts.html
You could do a packet capture (wireshark is a good tool) and if the device has a static IP address, there should be an ARP broadcast packet coming out. Then set a static IP on your pc on the same subnet. You should then be able to get to the GUI...
If it is provisioned and locked down, that can prevent factory reset, and in that case you should return it to the place of purchase for one that works. or ask them for the password.
If you used a credit card and the vendor will not give you one that works, you can reverse the charge with them.
Hope it helps,
Dan
