HP proliant ML110 Operation And Maintenance Manual page 73

Power Problems
The server does not turn on.
1. Make sure that the server's power cord is properly connected to the power supply cable
socket located on the rear panel and is plugged in to a known good power source.
2. If the server is connected to a UPS (Uninterruptible Power Supply) unit or a PDU (Power
Distribution Unit), disconnect the server from it and connect the power cord directly to a
known good power source.
3. Verify that the AC power outlet is not faulty by plugging in a known good device.
4. Check the circuit breaker for the AC power outlet.
a. If the breaker was off, verify all devices connected to the server share the same
b. Reset the circuit breaker after reconfiguring the devices if needed.
5. Make sure the PSU cables are connected to their mainboard connectors (CN1 and CN2).
6. If the server fans (system fan, CPU fan, and PSU fan) are not audible and the above steps
are verified:
a. Disconnect the power cord/s for five minutes in order to reset the power supply's
b. With the power cord disconnected, remove the system covers.
c. Remove all the accessory boards, including any hard disk drive controller board.
d. Disconnect all mass storage power cords and cables.
e. Plug the power cord/s back in and turn on server.
NOTE: Typically, all server fans run when power is turned on and all fans are off when the power is
turned off.
If the server's cooling system still failed to function:
1. Review the items under the "Troubleshooting Checklist" section earlier in this chapter.
2. Verify all cable connections:
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If the server fans still failed to function, call your HP Customer Support provider.
The power indicator does not light green after the power button is pressed.
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Remove the AC power cord, wait 15 seconds, reconnect the power cord, and try again.
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Verify all cables and power cords are firmly plugged into their respective receptacles.
HP ProLiant ML110 Server Operations and Maintenance Guide
circuit breaker and are the only devices on it.
circuitry.
AC power cord from AC source outlet to server
DC power supply cable to system board
DC power supply cables to all mass storage devices, including the flexible disk drive
DC power supply cable to all fans
System Maintenance
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