2-8 Sun StorEdge 5310 NAS Troubleshooting Guide December 2004
3. If you do not press <F2> or <Esc> or <F4> and do NOT have a device with an
operating system loaded, the boot process continues and the system beeps once.
The following message is displayed:
Operating System not found
4. At this time, pressing any key causes the system to attempt a reboot. The system
searches all removable devices in the order defined by the boot priority.
During POST, the server BIOS presents screen messages to indicate error conditions.
POST also provides beep codes to give you audible clues regarding the performance
and operation of the server when there is no video display that can present error
messages. In addition, a set of four bi-color diagnostic LEDs is located on the back
edge of the server main board. These LEDs are active during POST and indicate the
state of the server. Each of the four LEDs can have one of four states: Off, Green,
Red, or Amber. See “Power-On Self-Test (POST)” on page2-7 for a complete
description of the screen messages, beep codes, and diagnostic LEDs.

Verifying Proper Operation of Key System LEDs

As POST determines the system configuration, it tests for the presence of each mass
storage device installed in the system. As each device is checked, its activity light
should turn on briefly. Check to see if the disk drive activity light for each drive
turns on briefly.
2.2.3.2 Power LED Does Not Light
Check the following:
Is the system operating normally? If so, the power LED is probably defective or
the cable from the front panel to the server board is loose.
Are there other problems with the system? If so, check the items listed under
“System Cooling Fans Do Not Rotate Properly” on page2-8.
If all items are correct and problems persist, contact your service representative or
authorized dealer for help.
2.2.3.3 System Cooling Fans Do Not Rotate Properly
If the system cooling fans are not operating properly, system components could be
damaged.
Check the following:
Is AC power available at the wall outlet?
Is the system power cord properly connected to the system and the wall outlet?