Tried rebooting, and the same four nodes had the same behavior.
I got a message on the primary when I booted it that
vSMP ??? version mismatch
???? ???? 04:00:0#1 =>..:
The DARK RED type on top of the DARK BLUE background
is IMPOSSIBLE TO READ!!!!!!!!
The last .12.14.16 correspond to the missing nodes.
I made all the flash drives from one copy of the latest free download.
I rewrote the ones that had been used in the AMD SMP nodes.
Tried to hit F5 on the primary, but running remote VNC desktop (Fast-X)
and watching the boot using Java console emulation, the keystrokes were
ignored. The machine room is a mile away.