Compaq Armada 7800 Reference Manual page 226

Possible Cause
System initiated Suspend after a user-defined timeout expired.
Solution
Press the suspend button to exit Suspend.
Possible Cause
Computer initiated a low battery Suspend or Hibernation.
Solutions
Replace the battery pack and exit Suspend or Hibernation.
Connect the computer to an external power source and exit
Suspend or Hibernation.
Possible Cause
Power Management, which controls Suspend and Hibernation, is
disabled and the battery pack has discharged.
Solutions
Replace the battery pack and turn on the computer.
Connect the computer to an external power source and turn on
the computer.
Troubleshooting 16-29