Dell Latitude E5420 Guide D'installation page 6

3 Before you undock your computer, set your computer's power
management settings so that it does not enter sleep, standby, or hibernate
mode when you close (lower) the display:
Windows 7:
Click Start→ Control Panel→ Hardware and Sound→ Power
a
Options→ Change what closing the lid does.
Under the When I close the lid drop-down menu, select Do nothing.
b
Windows Vista:
Click Start→ Control Panel→ Mobile PC→ Power Options→
a
Change what closing the lid does.
Under the When I close the lid drop-down menu, select Do nothing.
b
Windows XP:
Click Start → Control Panel→ Performance and Maintenance→
a
Power Options→ Advanced.
Under the When I close the lid drop-down menu, select Do nothing.
b
Docking Your Computer to the Battery Slice
1 Follow the procedures in "Setting up Your Battery Slice" on page 3.
2 Turn over the computer and lower the battery slice until it clicks into place.
3 Flip the computer and power it ON.
4
Battery Slice