HP ProBook 455 G1 Notebook PC - Manual (Page 100)

B Troubleshooting
The following sections are included in this appendix:
Troubleshooting resources
● Access website links and additional information about the computer through HP Support
Assistant. To access HP Support Assistant on the Start screen, select the HP Support Assistant
app.
NOTE: Some checkup and repair tools require an Internet connection. HP also provides
additional tools that do not require an Internet connection.
● Contact HP support. For U.S. support, go to http://www.hp.com/go/contactHP . For worldwide
support, go to http://welcome.hp.com/country/us/en/wwcontact_us.html .
Choose from the following types of support:
◦ Chat online with an HP technician.
NOTE: When chat is not available in a particular language, it is available in English.
◦ E-mail HP support.
◦ Find HP support worldwide telephone numbers.
◦ Locate an HP service center.
Resolving issues
The following sections describe several common issues and solutions.
The computer is unable to start up
If the computer does not turn on when you press the power button, the following suggestions may
help you determine why the computer does not start up:
● If the computer is plugged into an AC outlet, plug another electrical device into the outlet to be
sure that the outlet is providing adequate power.
NOTE: Use only the AC adapter provided with the computer or one approved by HP for this
computer.
● If the computer is plugged into an external power source other than an AC outlet, plug the
computer into an AC outlet using the AC adapter. Be sure that the power cord and AC adapter
connections are secure.
The computer screen is blank
If the screen is blank but you have not turned off the computer, one or more of these settings may be
the cause:
● The computer may be in the Sleep state. To exit Sleep, briefly press the power button. Sleep is
an energy-saving feature that turns off the display. Sleep can be initiated by the system while the
90 Appendix B Troubleshooting