This usually mean you didn't change the sysid on the very first boot. Once it's boot looped, you need to clear the reservations file.
Reboot, and CTRL-C to bring up the boot menu
*******************************
* *
* Press Ctrl-C for Boot Menu. *
* *
*******************************
^CBoot Menu will be available.
From the bootmenu, enter the systemshell:
Please choose one of the following:
(1) Normal Boot.
(2) Boot without /etc/rc.
(3) Change password.
(4) Clean configuration and initialize all disks.
(5) Maintenance mode boot.
(6) Update flash from backup config.
(7) Install new software first.
(8) Reboot node.
Selection (1-8)? systemshell
Forking /bin/sh
pid: 1062
#
From the systemshell, remove the reservations file
# rm /sim/dev/,disks/,reservations
Exit back to the boot menu:
# exit
And pick option 8 to reboot the simulator
Please choose one of the following:
(1) Normal Boot.
(2) Boot without /etc/rc.
(3) Change password.
(4) Clean configuration and initialize all disks.
(5) Maintenance mode boot.
(6) Update flash from backup config.
(7) Install new software first.
(8) Reboot node.
Selection (1-8)? 8
Reboot now? (y or n): y
If you are prompted about a sysid mismatch during boot, pick Y.
If you had already assigned disks, go into maintenance mode and reassign them to the new sysid.
That should get it going.