Dell Latitude D820 Technical Manual page 61

3. Turn on the computer.
NOTE: Battery operating time (the time the battery can hold a charge) decreases over time.
Depending on how often the battery is used and the conditions under which it is used, you may
need to purchase a new battery during the life of your computer.
Check the battery status light — If the battery status light flashes orange or is a steady orange the
battery charge is low or depleted. Connect the computer to an electrical outlet.
If the battery status light flashes green and orange, the battery is too hot to charge. Shut down the
computer, disconnect the computer from the electrical outlet, and then let the battery and computer
cool to room temperature.
If the battery status light rapidly flashes orange, the battery may be defective. Contact Dell (see
Contacting Dell).
Check the battery temperature — If the battery temperature is below 0° C (32° F), the computer will
not start up.
Test the electrical outlet — Ensure that the electrical outlet is working by testing it with another device,
such as a lamp.
Check the AC adapter — Check the AC adapter cable connections. If the AC adapter has a light,
ensure that the light is on.
Connect the computer directly to an electrical outlet — Bypass power protection devices, power strips,
and the extension cable to verify that the computer turns on.
Eliminate possible interference — Turn off nearby fans, fluorescent lights, halogen lamps, or other
appliances.
Adjust the power properties — See
Reseat the memory modules — If the computer power light turns on but the display remains blank,
reinstall the memory modules (see Memory).
Ensuring Sufficient Power for Your Computer
Your computer is designed to use a 65-W or 90-W AC adapter. However, for optimum system
performance, you should always use a 90-W adapter.
Using less-powerful AC adapters, including the 65-W AC adapter, will cause you to receive a
WARNING message.
Docking Power Considerations
Due to the extra power consumption when a computer is docked to the Dell D/Dock, normal computer
operation is not possible on battery power alone. Ensure that the AC adapter is connected to your
computer when the computer is docked to the Dell D/Dock.
Docking While the Computer Is Running
If a computer is connected to the Dell D/Dock or Dell D/Port while the computer is running, presence
of the docking device is ignored until the AC adapter is connected to the computer.
Configuring Power Management Settings.