Instructions
Hold down the "Power" button for at least four seconds. Proceed to Step 2 if the DSi XL does not reset.
View the DSi XL's back side and locate the battery compartment positioned on the left side.
Remove the battery cover's two screws with the Phillips-head screw driver and pull off the cover.
Pull the battery pack out of the DSi XL. Without power, the screen shuts off.
Reinstall the battery and cover.
Press the "Power" button to turn the unit back on.