HP EliteDesk 800 G3 TWR User Manual

System does not power on and the LEDs on the front of the computer are not ashing.
Cause Solution
System unable to power on. Press and hold the power button for less than 4 seconds. If the
hard drive LED turns white, then:
1. If equipped with 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 seconds. If the
hard drive LED does not turn on white then:
1. Check that 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 o, then replace
the power supply.
6. Replace the system board.
92 Chapter 6 Troubleshooting without diagnostics

HP EliteDesk 800 G3 TWR Specifications

General

Form Factor	Tower
Processor Options	Intel Pentium, Intel Celeron
Memory	Up to 64 GB DDR4-2400 SDRAM
Storage Options	2.5" HDD/SSD, M.2 SSD
Graphics	Intel HD Graphics 630
Operating System	Windows 10 Pro
Audio	Realtek HD ALC221-VB Audio
Expansion Slots	1 PCIe x16
Ports (Front)	2 x USB 3.1 Gen 1, 2 x USB 2.0, 1 x headphone/microphone combo
Ports (Rear)	4 x USB 3.1 Gen 1, 4 x USB 2.0, 1 x VGA, 1 x DisplayPort, 1 x RJ-45, 1 x audio line-out, 1 x audio line-in
Power Supply	250W, up to 92% efficient PSU
Optical Drive	Optional DVD-Writer
Chipset	Intel® Q270