HP ZBook Studio G4 Maintenance And Service Manual page 78

1. Power-on: Common issues are No Power, Recycle/Reboot, etc.
2. POST: Common issues are No Boot (have power), Light Flash or Diagnostics Error.
3. Performance: Common issues are Intermittent Loss of Power, Blue Screen, Hang, etc. In many cases,
issues may be identified and associated with a particular hardware (i.e., display, storage).
Table 4 categorizes failures by hardware.
4. Display
5. I/O devices (Input/Output)
6. Storage
7. Mechanical
A single symptom can be listed under different groups. For example, No Video can belong to (1) Power-on or
(4) Display; but Flickering when powered should be listed in (4) Display. Or, in another example, a blue screen
can be caused by a driver conflict in Performance (4), but it can also be caused by a defective hard drive under
(6) Storage. Therefore, failures that share similar symptoms are noted..
If possible, make a record of the failure symptom, the phase of the boot-up sequence where the failure
occurs, and the most likely location in the failure tree
on page 66
help isolate the issue and indicate the next steps. For example, when the computer is running the operating
system, it may experience an issue with (4) Display, (5) I/O devices (keyboard, wireless, and so on), (6)
Storage, or (7) Mechanical components (stuck buttons, thermal shutdown, and so on).
NOTE: "Uncategorized" is used if an issue found is not listed. For example, Bluetooth is offered on certain
hardware configurations; therefore, a Bluetooth issue can be classified under "I/O Device" if needed.
Failure classification by boot-up sequence
Table 6-3 Failure classification by boot-up sequence
1. Power-on
1. No Power on page 85
2. Intermittent power-on, shutdown,
reboot on page 87
3. AC adapter issue on page 88
4. Battery not recognized, not charging
on page 88
5. Battery discharges too fast
on page 90
6. Burnt smell on page 91
a,b,c similar symptoms
66 Chapter 6 Troubleshooting guide
and Table 6-4 Failure classification by hardware devices and mechanical on page
a
(Table 6-3 Failure classification by boot-up sequence
2. POST
1. No video (with power)
on page 91
2. Blinking lights on page 92
3. Diagnostics error messages
on page 93
4. BIOS password on page 94
67). This will
3. Performance
1.
Intermittent shutdown on page 95
2.
Blue screen (BSOD) error on page 121
3. Freeze at Windows Logo (hang/lockup)
on page 98
4. Electromagnetic Interference (EMI)
on page 99
5. No wake up on page 100
6. Unresponsive on page 101
7.
Slow performance on page 101
8. HP Smart Adapter warning message
on page 102
9. Incorrect time and date on page 102
a
b
c