Dell 1210S Projector - Manual (Page 41)

You can enable or disable the Test Pattern by selecting Off, 1 or 2. You can also
invoke the Test Pattern 1 by pressing and holding down and buttons on the
control panel simultaneously for 2 seconds. You can also invoke the test pattern 2
by pressing and holding down and buttons on the control panel
simultaneously for 2 seconds.
Test Pattern 1:
Test Pattern 2:
F ACTORY R ESET — Select and press to reset all settings to its factory default, the
warning message below appears.
Reset items include both computer sources and video source settings.
Using Your Projector 41