HP Elite x2 G8

Boot up sequence
The computer performs several steps after you press the power button or restart the computer.
It is important to understand where in the boot-up sequence the symptoms occur. The following table lists
the phases of the boot-up sequence and explains the symptoms that may occur in each phase. For example, a
blue screen error (BSOD) often occurs during the performance phase.
Table 7-3 Boot-up sequence and associated failures
Item Procedure
Startup After you press the power button, the computer boots after all internal power rails (such as 5 V, 3.3 V) are
stable.
Conrm that power lights are on and fan is spinning.
Common issues: all lights are o; troubleshooting lights are on; computer does not boot; video is absent.
POST (UEFI/BIOS) Power-On Self-Test (POST) veries that hardware components (such as processor, hard drive, memory) are
functional. When POST is complete, the HP logo appears briey and then disappears.
If there are errors, the computer may exhibit blinking lights and POST error messages, and so on.
Common issues: lights blink; error message appears; system hangs (lock up or freezes)
Performance
(operating system)
System boots to operating system, and Windows logo screen appears.
Common issues: hangs, blue screen, distorted video, driver conict, slow performance, display issue (dead
pixel), I/O issue (no speaker sound), wireless/audio unavailable, noise.
See Analyze the issue on page 73 table for detailed troubleshooting information.
Failure classication
Failure classication is a breakdown of dierent types of failures and symptoms that could occur during the
boot-up sequence.
Table 7-4 Failure classication by boot-up sequence on page 71 and Table 7-5 Failure classication by
hardware devices on page 71 represent the failure classication for common notebook failures.
Table 7-4 Failure classication by boot-up sequence on page 71 categorizes failures by the boot-up
sequence.
1. Power-on: Common issues are no power, recycle, or reboot.
2. POST: Common issues are no boot (despite power), light ash, or diagnostics error.
3. Performance: Common issues are Intermittent Loss of Power, Blue Screen, Hang. In many cases, issues
can be identied and associated with particular hardware (for example, display or storage).
Table 7-5 Failure classication by hardware devices on page 71 categorizes failures by hardware:
● Display
● I/O (input/output) devices
● Storage
● Mechanical
70
Chapter 7 Troubleshooting guide