HP Pro Mini 260 G9 Desktop PC Maintenance and Service Guide - Page 49

Solving power problems, Power supply shuts down intermittently, Computer turned off automatically

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Cause System unable to power on. Solution Press and hold the power button for less than 4 s. If the hard drive light turns white, then: 1. If the computer has a voltage selector, check that the voltage selector (located on the rear of the power supply) is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Remove the expansion cards one at a time until the 5V_aux light on the system board turns on. 3. Replace the system board. OR Press and hold the power button for less than 4 s. If the hard drive light does not turn white, then: 1. Check whether the unit is plugged into a working AC outlet. 2. Open the access panel and check that the power button cable is properly connected to the system board. 3. Check that the power supply cables are properly connected to the system board. 4. Check to see if the 5V_aux light on the system board is turned on. If it is turned on, then replace the power button assembly. 5. If the 5V_aux light on the system board is off, then replace the power supply. 6. Replace the system board. Solving power problems These tables provide common causes and solutions for power problems. Power supply shuts down intermittently Use this information to troubleshoot the computer. Cause If the computer has a voltage selector, voltage selector switch on rear of computer chassis (some models) not switched to correct line voltage (115 V or 230 V). Power supply will not turn on because of internal power supply fault. Solution Select the proper AC voltage using the selector switch. Replace the power supply. Computer turned off automatically, power light blinks red two times followed by a two-second pause, and the computer beeps two times (Beeps stop after fifth iteration but lights continue blinking) Use this information to troubleshoot the computer. 42 Chapter 5 Troubleshooting without diagnostics

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Solution
Cause
Press and hold the power button for less than 4 s. If the hard drive light turns
white, then:
1.
If the computer has a voltage selector, check that the voltage selector
(located on the rear of the power supply) is set to the appropriate
voltage. Proper voltage setting depends on your region.
2.
Remove the expansion cards one at a time until the 5V_aux light on the
system board turns on.
3.
Replace the system board.
OR
Press and hold the power button for less than 4 s. If the hard drive light does
not turn white, then:
1.
Check whether the unit is plugged into a working AC outlet.
2.
Open the access panel and check that the power button cable is
properly connected to the system board.
3.
Check that the power supply cables are properly connected to the
system board.
4.
Check to see if the 5V_aux light on the system board is turned on. If it is
turned on, then replace the power button assembly.
5.
If the 5V_aux light on the system board is off, then replace the power
supply.
6.
Replace the system board.
System unable to power on.
Solving power problems
These tables provide common causes and solutions for power problems.
Power supply shuts down intermittently
Use this information to troubleshoot the computer.
Solution
Cause
Select the proper AC voltage using the selector switch.
If the computer has a voltage selector, voltage
selector switch on rear of computer chassis
(some models) not switched to correct line
voltage (115 V or 230 V).
Replace the power supply.
Power supply will not turn on because of
internal power supply fault.
Computer turned off automatically, power light blinks red two times followed by a
two-second pause, and the computer beeps two times (Beeps stop after fifth iteration
but lights continue blinking)
Use this information to troubleshoot the computer.
42
Chapter 5
Troubleshooting without diagnostics