HP Server rp7420 HP 9000 rp7420 Server - User Service Guide, Fifth Edition - Page 68

The Server Powers On Then Shuts Off With a Fault Light, Cell Board Extraction Levers

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1. Check each BPS LED. The LED is located in the lower left hand corner of the power supply face. Table 5-3 shows the states of the BPS LEDs. A yellow LED indicates that the line cord connections are not consistent with the pwrgrd settings. 2. Verify that the power supply and both power cords are plugged in to the chassis. The Server Powers On Then Shuts Off With a Fault Light Use this checklist to check for the following problems when the server powers on and then off: 1. Ensure that a conductive item has not been dropped or left inside the server chassis. 2. Check the connections on all boards. 3. Check the system backplane for bent pins. Use the ps command at the Command Menu to display detailed power and hardware status for selected system hardware. Cell Board Extraction Levers It is important that both extraction levers on the cell board be in the locked position. Both levers must be locked in order for the MP to recognize that the cell board is powered on and functioning properly. Power to the cell board should only be removed using the MP:CM> PE command or by shutting down the partition or server. Therefore, if the levers become unlocked, the partition will not have a chance to logically shut down, and damage could occur to the operating system. If the cell board is powered on and one lever becomes unlocked, the cell board stays powered on. However, if the cell board is powered off, it does not power on until the cell board is extracted, reinserted, and both levers are in the locked position. The lever status can be determined by issuing the MP:CM> DE command and viewing the power status of the cell board controller (PDHC). The "ready" bit is true only when both levers are locked and all VRMs are installed. Use this status to determine if both levers are locked, and the cell board is properly installed in the chassis. For a sample of the output, see Figure 5-1. If the state is RDY (all caps), it means that the "ready bit" is true. If the state is rdy (lower case) it means that the "ready bit" is false. The meaning of each of these states is listed below. 68 Troubleshooting

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1.
Check each BPS LED.
The LED is located in the lower left hand corner of the power supply face.
Table 5-3
shows
the states of the BPS LEDs.
A yellow LED indicates that the line cord connections are not consistent with the
pwrgrd
settings.
2.
Verify that the power supply and both power cords are plugged in to the chassis.
The Server Powers On Then Shuts Off With a Fault Light
Use this checklist to check for the following problems when the server powers on and then off:
1.
Ensure that a conductive item has not been dropped or left inside the server chassis.
2.
Check the connections on all boards.
3.
Check the system backplane for bent pins.
Use the
ps
command at the Command Menu to display detailed power and hardware status
for selected system hardware.
Cell Board Extraction Levers
It is important that both extraction levers on the cell board be in the locked position. Both levers
must be locked in order for the MP to recognize that the cell board is powered on and functioning
properly.
Power to the cell board should only be removed using the MP:CM>
PE
command or by shutting
down the partition or server. Therefore, if the levers become unlocked, the partition will not
have a chance to logically shut down, and damage could occur to the operating system.
If the cell board is powered on and one lever becomes unlocked, the cell board stays powered
on. However, if the cell board is powered off, it does not power on until the cell board is extracted,
reinserted, and both levers are in the locked position.
The lever status can be determined by issuing the MP:CM>
DE
command and viewing the power
status of the cell board controller (PDHC). The “ready” bit is true only when both levers are
locked and all VRMs are installed. Use this status to determine if both levers are locked, and the
cell board is properly installed in the chassis. For a sample of the output, see
Figure 5-1
. If the
state is
RDY
(all caps), it means that the “ready bit” is true. If the state is
rdy
(lower case) it means
that the “ready bit” is false. The meaning of each of these states is listed below.
68
Troubleshooting