Dell Inspiron 2000 Manual page 21

Press any key on the integrated keyboard, and then wait several seconds. If the display image returns to normal, the computer was in standby mode to conserve power.
If the battery status indicator is blinking to report a low charge, connect the AC adapter to the computer or install a second battery in the media bay.
Adjust the brightness.
If the computer is attached to an external monitor, press so that the video image appears on the display.
If the computer is turned off, press the power button to turn on the computer.