HP OmniBook 7100 Reference Manual page 121

Turn off the OmniBook, then check that the battery contacts are clean and that
the ac adapter cables are fully plugged in.
Move the OmniBook away from any nearby heat source. Unplug the ac adapter
and allow the battery to cool down. An elevated battery temperature prevents
charging.
If available, try another battery and ac adapter.
If the second battery doesn't charge
The OmniBook's second battery doesn't charge until the main battery is fully
charged.
Make sure the ac adapter is plugged into the power source.
Check that the light on the ac adapter is on.
Check that the second battery module is fully installed and locked in place.
If the OmniBook stops responding
Press CTRL+ALT+DEL to end the application that is not responding.
Press the blue power button to suspend the OmniBook. Then press the blue
button again to turn the OmniBook back on.
If nothing happens, insert a paper clip into the system-off button on the right side
of the OmniBook. Then press the blue button to turn the OmniBook on.
If the OmniBook doesn't suspend as expected
If you have a connection to another computer, the OmniBook doesn't suspend if
the connection is actively in use.
If the OmniBook is performing an operation, it normally waits for the operation
to finish.
Troubleshooting
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