How to automatically boot the Fujitsu PrimePower 450 server without stopping at OK Prompt

Problem

OBP (OpenBoot PROM) auto-boot=auto did not work after power failure on Fujitsu PrimePower 450 (4U)

Identify the problem

1. Check:
   - auto-boot
   - boot-command
   - boot-device
   - Server maintenance switch
2. auto-boot should be set to TRUE
3. boot-command should be set to BOOT
4. boot-device should be set to DISK
5. Server maintenance switch should be set to LOCK
   

Solving the problem

1. Set auto-boot = TRUE
   From the OK Prompt, type:
   
   printenv
   
   If auto-boot is FALSE, type:
   
   setenv auto-boot true
2. Set boot-command = BOOT
   From the OK Prompt, type:
   
   setenv boot-command boot
3. Set boot-device = DISK
   
   From the OK Prompt, type:
   
   setenv boot-device disk
4. Set server maintenance switch to LOCK (only for PrimePower 450).
   On the server front panel, look for a switch (see picture above). If the switch position is at UNLOCK or MAINTENANCE, move the switch to LOCK.
5. Switch off the server, then switch on again to see if the problem solved.

Note: I look for the solution over the Internet for several months. I already did step 1 to 3 and make sure that all the settings already correct. But still the server doesn’t want to boot automatically. Until I finally find out that by switching the SERVER MAINTENANCE SWITCH to LOCK, that solved the problem.