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AC adapter issue
Symptoms
No sign of power
●
●
No boot
No rear power light
●
●
No front power light
Battery does not charge when AC adapter is
●
connected
Tips and tricks
80
Chapter 6 Troubleshooting guide
Solution
Possible causes
AC adapter and others (i.e., external power source)
Troubleshooting steps
Quick check
1.
Verify external power source
2.
Remove all external devices, including docking station.
3.
Perform a hard reset for the computer
4.
Disconnect and reassemble the power cord and adapter in case the adapter
experienced short circuit, over current, over temperature events.
5.
Use a verified working adapter. If the computer operates normally, there is a
problem with the original adapter.
6.
Verify that the AC adapter works on a verified working computer. If the
computer operates normally, there is no problem with the adapter. See
Smart Adapter warning message on page 96
Verify AC adapter
1.
Remove working battery.
2.
Verify that AC adapter is compatible with product. Verify that part number is
for this computer if possible.
3.
Inspect AC adapter and power cord for physical damage, bent middle ID pin.
4.
Plug in AC adapter and power the computer without battery.
5.
Inspect the power port on computer side for any damage, dust, debris.
6.
Check power light
(7. Status lights, blinking light codes, troubleshooting lights,
and POST error messages on page
external power to the computer is good.
7.
If there is still no rear power light or no boot, replace the AC adapter.
The HP Smart AC adapter has a special pin in the middle, called the ID pin, for power
rating and throttling purpose. If this pin is broken, the rear power light will be on but
the power button and front power lights will blink continuously and the computer
will not turn on. Third party AC adapter will not work on the computer.
Use the AC adapter that came with the computer for better performance.
(2. Examine the environment on page
(8. Hard reset on page
for further information.
68). Rear power light indicates that
62).
70).
HP
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Table of Contents
Troubleshooting
