Safe Mode; Test With Verified Working Configuration (Hardware Or Operating System) - HP ZBook Power G10 Maintenance And Service Manual

This essential configuration is often used to troubleshoot power-on related issues, such as no-boot,
reboot, and freezing issues.
The essential hardware consists of the following components:
● System board
● AC adapter (unplug nonremovable battery or remove battery)
● Processor (and heat sink or fan). The processor might be integrated into the system board.
● Memory (one verified working memory DIMM)
● Graphics card (if no VGA port is available on the system board). Platform may have both Intel
integrated graphics and discrete graphics. Therefore, you might not need a discrete graphics card.
● External VGA monitor
● External USB keyboard
● External mouse
NOTE: After you remove the service door, disconnect all connections (internal keyboard, display,
discrete GPU, hard drive or solid-state drive, daughterboards, and so on) to achieve the essential
hardware configuration. Do not disassemble the system board from its enclosure at this time.
Reverse the previous procedure by reinstalling each piece of hardware removed, one piece at a
time, and testing your computer after each installation. Because your computer works with only the
essential hardware installed, those parts must be working properly. This means that one of the hardware
components removed is causing the computer to fail. By installing each device back into the computer
and testing each time, you eventually identify the failing hardware.

Safe mode

A driver conflict often results in a blue screen error message. Booting in safe mode can resolve many
issues in Windows because safe mode forces the computer to load a limited version of Windows which
contains only essential files.
Safe mode is useful for troubleshooting problems with programs and drivers that might not
start correctly or that might prevent Windows from starting correctly. If a problem does not
reappear when you start in safe mode, eliminate the default settings and basic device drivers
as possible causes. For more information about how to start your computer in safe mode, see
http://support.hp.com/us-en/document/c03439317.

12. Test with verified working configuration (hardware or operating system)

One troubleshooting technique that can quickly isolate an issue is using a verified working part while
testing. A good example is to use an external keyboard, mouse, or VGA monitor when you have issues
with an internal keyboard, touchpad, or display.
Testing with a verified working AC adapter can identify an error caused by a faulty one. Similarly, testing
with a verified working operating system can determine bad behaviors of the current operating system.
See Non HP diagnostics tools on page 76
USB.
NOTE: In some situations, more than one item may contribute to a problem.
82 Chapter 6 Troubleshooting guide
for instructions about obtaining and using a Windows-To-Go