"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models: 1246, 1277, 1278, and 1279
a cold start) press and hold down the Power Button for at least four seconds, which will cause a manual shutdown.
Then, restart it with a single press of the Power Button. If it still doesn't recover, do the following:
1. Press the Power Button and hold it for four seconds to shut it down.
2. Remove the battery or unplug the AC power for at least 30 seconds.
3. Reinsert the battery or reconnect AC power.
4. Press the Power Button once to reboot.
Battery Operating Time
Battery operating time is affected by variables, such as the following:
● Power conservation settings
● Hardware configuration
● Software applications
● Installed options
● Display brightness
● Hard drive usage
● Power button
● Changes in operating temperature
● Type and number of installed PC Cards
For more information on increasing battery pack operating time, conditioning the battery pack, and disposing of a
used battery pack, refer to the Battery Pack Operations.
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