HP OmniBook 2100 Reference Manual page 122

Troubleshooting
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 secondary battery doesn't charge
The OmniBook's secondary 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 secondary 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. Press the blue
power 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.
Check the Power Button Mode in the BIOS Setup utility (Power menu). You can
configure the power button to either suspend or shut down the OmniBook.
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