Intermittent Power-On, Shutdown, Reboot - HP ZBook Power G10 Maintenance And Service Manual

Table 6-9 Issues, possible causes, and fixes (continued)
Items
Tips

Intermittent power-on, shutdown, reboot

Use this information to troubleshoot power-on, shutdown, and reboot issues.
Table 6-10 Issues, possible causes, and fixes
Items
Symptoms
Does not always turn on
●
Intermittently hangs
●
Intermittently shuts down
●
Spontaneously reboots
●
The following steps are for authorized providers or technicians.
88 Chapter 6 Troubleshooting guide
Procedures
Computer automatically boots without pressing power button when the RTC 3 V
battery is removed. Therefore, after the service door and RTC 3 V battery are
removed, you do not have to press power button from top side.
In essential hardware configuration, mWS G1 and G2 may require discrete
graphics processing unit (GPU) to boot. However, mWS G3 can boot with
integrated graphics.
Procedures
Possible causes
Electrical short, fluctuating power source, unstable power rails, loose connections, bent
pins, stray wires, dust, obvious damage, nearly faulty parts (bulging or leaking capacitor).
Potentially turn into a no-power issue
Troubleshooting steps
1. Visually check power ports on both AC adapter and computer sides.
2. Inspect power sources:
a. Verify that the AC adapter is working correctly. Use a confirmed working adapter
to test.
b. Verify that battery is not depleted while system is in the Sleep state. Test with a
confirmed working battery.
1. Follow actions in No power on page
a. Be sure that AC adapter has correct DC voltage.
b. Verify battery: test with a confirmed working battery.
c. Verify that power button is not stuck.
d. Verify that power connector is not loose.
e. Remedy loose connections and reseat major components (processor, memory,
GPU, hard drive, solid-state drive, and others).
2. Perform visual check for loose connections, bent pins, stray wires, dust, nearly faulty
parts (bulging or leaking capacitor).
3. Test essential hardware configuration
a. If system boots, reinstall nonessential hardware one component at a time to
isolate issue.
b. If system does not boot, replace essential hardware with verified working parts,
one component at a time. If system still does not boot, replace system board.
(No power on page 86).
86.
(11. Test with minimum configuration on page 81)