you see the "No Signal" message when you display from a PC laptop,
you need to set up the laptop to display on an external
Hold down the laptop's Fn key
and press the key labelled with a monitor icon or CRT/LCD. (See your laptop manual for details.)
Wait a few seconds for an image to appear.
To display on both the laptop's monitor and the projector,
try pressing the same keys again.
If the same image is not displayed by the laptop and
projector, check the Windows Display
utility to make sure the external monitor port is enabled. (See
your computer or Windows manual for instructions.)
If necessary, check your video card settings and set the
multiple display option to Clone.