HP EliteOne 870 Maintenance and Service Guide - Page 61
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. 54 Chapter 5 Troubleshooting without diagnostics