HP EliteDesk 800 G8 Maintenance and Service Guide - Page 64
Solving power problems, Power supply shuts down intermittently, Computer turned off automatically
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Cause Solution 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 Solution 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). Select the proper AC voltage using the selector switch. Power supply will not turn on because of internal power supply Replace the 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. Cause Solution Processor thermal protection activated. A fan might be blocked 1. or not turning, or the heat sink is not properly attached to the processor. 2. 3. Be sure that the computer air vents are not blocked and the processor cooling fan is running. Open the access panel, press the power button, and see if the processor fan (or other system fan) spins. If the fan does not spin, be sure that the fan cable is plugged onto the system board header. If the fan is plugged in and not spinning, replace it. Power light blinks red four times followed by a two-second pause and the computer beeps four times (Beeps stop after fifth iteration but lights continue blinking) Use this information to troubleshoot the computer. 56 Chapter 5 Troubleshooting without diagnostics