1. Turn off the computer.
2. Remove the computer from any port replicator or docking station.
3. Disconnect all external connected peripheral devices such as USB storage devices, external
displays, and printers.
4. Unplug the AC adapter from the computer.
5. Disconnect the battery.
6. Press and hold the power button for at least 15 seconds to drain residual power.
7. Reconnect the battery and plug the AC adapter back into the computer, but do not connect any of
the peripheral devices.
8. Press the power button to turn on the computer.
9. If a startup menu appears, use the arrow keys to select Start Windows Normally, and then press the
enter key.
10. After reconnecting each of the peripheral devices, run Windows Update and HP Support Assistant
to update all device drivers.
CMOS refers to the battery-powered semiconductor chip located on computer's system board.
Notebooks store low-level settings like the system time and hardware settings in CMOS. Sometimes
you must clear CMOS, which requires removing and reinserting the 3 V RTC battery for a short time (a
few minutes before reinserting), in addition to removing the AC adapter and battery.
NOTE: Clearing the CMOS should only be performed for troubleshooting purposes. There is no
reason to clear CMOS if the computer is working properly.
You must remove the notebook service door to access the CMOS battery. If the computer has
a replaceable RTC battery, see the RTC battery replacement section for the battery removal or
replacement.
9. Soft reset (Default Settings)
If your computer has issues booting, has errors during boot, has issues after you add hardware, or has
other abnormal system behaviors that you cannot resolve through any other methods (for example, hard
reset), it may be necessary to reset the system BIOS to default settings.
NOTE: Some company policies prohibit updates or changes. Check whether the computer has
custom BIOS settings before taking action.
To load BIOS to default settings: Reboot the computer, and then press f10 > Main > Restore defaults. For
more information, see http://support.hp.com, and the search for BIOS Setup Utility Information and Menu
Options.
10. Reseat cables and connections
Many problems are caused by improper connections or loose connections because of abnormal
movement and vibration.
NOTE: Before disassembling the computer to reseat cables and connections, always disconnect
power and remove the battery, or disconnect a nonremovable battery.
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Chapter 6 Troubleshooting guide
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