Dell M409WX Projector - Manual (Page 29)

Using Your Projector 29
b Enable the Password function will pop-up a character screen, key in a 4-
digit number from the screen and press the Enter button.
c To confirm, enter the password again.
d If the password verification is successful, you may resume with accessing
the projector's functions and its utilities.
2 If you have entered incorrect password, you will be given another 2 chances.
After the three invalid attempts, the projector will automatically turn off.
NOTE: If you forget your password, contact Dell.
3 To cancel the password function, select OFF and enter the password to
disable the function.