HP EliteDesk 800 G6 Maintenance and Service Guide - Page 68

Computer powered off automatically and the power light blinks red four times and then white two time ..., System does not turn on and the lights on the front of the computer are not blinking

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Cause Solution 3. Some applications run in the background and can be closed by right-clicking their corresponding icons in the task tray. Some software applications, especially games, are stressful on 1. the graphics subsystem. Lower the display resolution for the current application or consult the documentation that came with the application for suggestions on how to improve performance by adjusting parameters in the application. 2. Add more memory. 3. Upgrade the graphics solution. Cause unknown. Restart the computer. Computer powered off automatically and the power light blinks red four times and then white two times 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. 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. 3. If fan a plugged in and not spinning, replace it. System does not turn on and the lights on the front of the computer are not blinking Use this information to troubleshoot the computer. 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. 58 Chapter 5 Troubleshooting without diagnostics

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Cause
Solution
3.
Some applications run in the background and can be closed
by right-clicking their corresponding icons in the task tray.
Some software applications, especially games, are stressful on
the graphics subsystem.
1.
Lower the display resolution for the current application or
consult the documentation that came with the application
for suggestions on how to improve performance by
adjusting parameters in the application.
2.
Add more memory.
3.
Upgrade the graphics solution.
Cause unknown.
Restart the computer.
Computer powered
off
automatically and the power light blinks red four times and
then white two times
Use this information to troubleshoot the computer.
Cause
Solution
Processor thermal protection activated. A fan might be blocked
or not turning, or the heat sink is not properly attached to the
processor.
1.
Be sure that the computer air vents are not blocked and the
processor cooling fan is running.
2.
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.
3.
If fan a plugged in and not spinning, replace it.
System does not turn on and the lights on the front of the computer are not
blinking
Use this information to troubleshoot the computer.
Cause
Solution
System unable to power on.
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.
58
Chapter 5
Troubleshooting without diagnostics