Some clarification:
When I power the unit all five leds turn on, including the GPS and the HOLDOVER leds. The gps antenna is NOT connected. From what I've read at least some of the leds should turn off after approximately 15 seconds, but they don't. All the leds are still on after half an hour. Further reading suggests the unit is stuck in a diagnostic mode and that the firmware might have been trashed. I don't know how to confirm or deny this.
I have connected an SMA adaptor to the gps socket and proved I have 5V on the socket, as my gps antenna is active (and will accept 3 to 5V dc input).
The paperwork I have leads me to believe the 9 pin female connector on the front panel, next to all the SMB connectors, should plug into a pc serial port with a straight through cable. I've not tried a crossover cable. I'm using a windows 2000 sp4 pc with a real serial port (not a usb dongle) and I've confirmed the pc port and cable works.
Waz