Guys if a 7970 "dies" in Manchester, i.e. it stays on a white cisco screen please follow the instructions below to default them back to factory settings
Procedure:
1) Power off 7970
2) Power on 7970 while holding the # key
3) The lines lamp should blink amber in sequence, let go of the # key
4) Press 123456789*0#
5) The lamps should blink green in sequence
6) The phone will obtain IP information via DHCP
7) The TERM70.default load will be loaded on the phone
8) The phone should recover the configuration file from CallManager, ifnot reset with **#** and your confriguration will be restored
Try this