In trying to diagnose what I thought was a keyboard problem,
(I was unable to interrupt the boot sequence to change the
boot device) I replaced the coin battery; now it continuously reboots, with a
one-minute cycle, and gives a "five low, one+one high" beep
sequence, then a steady-amber, 0x0C LED code
when it pauses. That is listed as "System RTC date/time not set"
There is no video while it is running through the POST; it displays
the "Server Board" splash screen when it pauses. There is no
keyboard response whatsover: no F2 hotkey, not even Caps Lock.
For want of anything else to try, I've tried each USB slot, all the same.
The keyboard worked before, and still works on other machines.