Troubleshooting 3-5
If Power Problem Occurs at Power-Up
If the system has a power problem on a cold start, the motherboard LEDs and the
OCP display will indicate a problem. The console, for systems running DIGITAL
UNIX or OpenVMS, will also indicate the problem. The console on systems running
NT will not print an error message. Causes of power problems are:
•
Broken system fan
•
Broken CPU fan
•
A power supply could be broken and the system could still power up
momentarily. (During power up, an over-current condition occurs with two
power supplies and is tolerated for a short period but a persistent over-current is
not.)
•
Power Control logic on the motherboard could fail
•
Interlock failure
•
Wire problems
•
Temperature problem (unlikely)
Recommended Order for Troubleshooting Failure at Power-Up
1.
Assuming you cannot bring the SRM console up, check the console output if the
system run either OpenVMS or DIGITAL UNIX. Restart the system if the
system runs NT and watch for an error message on the OCP display. Replace
the FRU indicated.
2.
If you can get to the SRM console, use the show power command. It will show
the last power fault.
3.
If neither step one nor step 2 identify an FRU, replace the motherboard.
