HP PROLIANT 8500 Troubleshooting Manual page 6

1) Did the POWER SUPPLY turn ON?
Did the Power-ON LED on the front panel turn on? Did the power supply fans and system fans
turn on (Visually see them spinning or hear them)? Are both power supply status LEDs on (solid
green). See Table 1 – 1. Also see Appendix B for normal power up sequence.
NO: Reason for power supply not to turn ON:
• Interlock problem (Check Interlock LEDs on top of system)
• Power Supply Problems (bad supply, supply insertion)
• Input power bad
Go to decision box 2.
YES: Power supply turned ON, Interlock and power seems to be ok. Go to decision box 5.
2) Are the POWER SUPPLY status LEDs in Standby mode (bottom LED solid green, top LED off)?
NO: If either of the power supply status LEDs isn' t in this state, then check the power supply
LED table to determine its state (Table 1 – 1). From that, there should be an indication of where
the problem is. If one of the power supply LED flashes green and then briefly flashes amber and
then goes back to flashing green, that is also a pretty good indication that a power supply is not
seated properly or the power supply is crowbarring.
YES: The power supply appears to not have been told to turn on, so the problem should be the
power supply not fully inserted (and/or bent pins on its connector). Check Power Switch and
Power Switch cable connected to the header E8 in the rear of the Removable Media Bay Module.
Go to decision box 3.
3) Is the AUX 5V LED ON (on system I/O board)?
Is AUX 5V LED (CR47) on the I/O board ON? The Aux 5v is the power source for the interlock
LEDs. If that power source isn' t there, the interlock LEDs won' t light to indicate interlock
problems. That is also an indication that there is a problem other than interlocks that is keeping
the power supply from turning on.
NO: This is an indication that the Interlock LEDs aren' t applicable and that the Power Supply or
a connection to it is bad.
• Check power supply insertion and for missing/bent pins on power supply.
• Check for possible shorts to the Aux 5v.
YES: Interlock power is good, indicates the interlock LEDs can be used, go to decision box 4.
4) Are the Interlock LEDs in the "Normal" (off) state?
Normal state is when the all System Interlock LEDs are OFF.
NO: The System Interlock LEDs (located on top of the system) when ON indicates that an
interlock violation exists. This should give you some indication who' s at fault. Reseat the board,
processor or module identified by the interlock LEDs.
YES: If all Interlock LEDs are OFF (no indication of interlock problems) then check the
following:
• Check the power switch and power switch cable connected to the Media Bay module
(E8)
• Reseat Memory board.
• Check power supply insertion and for missing/bent pins on power supplies.
FLOWCHART DECISION BOXES
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