Stuck Power Button; Additional Information; Acronyms - HP ZBook 15 G4 Maintenance And Service Manual

Stuck power button

Symptoms
● Rear power indicator light is on
● Will not turn on when power
button is pressed
● Automatically powers on
The sections below are intended for authorized service providers/technicians.

Additional information

The following sections provide additional information that can be used during the troubleshooting process.

Acronyms

The following acronyms are used in this chapter.
Blue screen (BSOD)—A Windows error screen that can occur if a problem causes your computer to shut down
or restart unexpectedly. When you experience this type of error, you will not be able to see items such as the
Start menu or the taskbar when your computer is turned on. Instead you might see a blue screen with a
message that your computer ran into a problem and needs to restart.
CPU—Central processing unit
DIMM—Dual in-line memory module
Daughterboard—Type of circuit board that plugs into or is attached to the system board or similar expansion
card to extend its features and services.
GPU–Graphics processor unit
GTS–General Troubleshooting Step
HDD–Hard drive
KB–Keyboard
LVDS–Low-Voltage Differential Signaling
MSG–Maintenance and Service Guide
mWS–Mobile Workstations
WS–Workstations
OS–Operating system
PC–Personal computer
POST–Power-On Self-Test
Possible causes
Sticky or defective power button.
Troubleshooting steps
General actions
1. Perform a hard reset (8. Hard reset on page
2. Perform a soft reset if system can turn on.
1. Disassemble the unit.
2. Inspect power button on the top cover and on the system board to make sure these
buttons move freely.
89).
Additional information 137