I have several 7960's with 1 each 7914 attached that have been working fine. I went to add a second 7914, first unplugging phone and 7914, then changing config to 'type 7960 addon 2 7914', then plugged the phone back in.
Now both 7914's are blank and all red lights, in spite of multiple phone resets and power cycling and combinations of both. If I change the config back to 'addon 1' and unplug the second 7914, everything is good. When I change the config back to 'addon 2' but second 7914 is still unplugged, first one is back to all red.
Any suggestions would be appreciated.