InFocus IN3902LB User Manual page 25

Problem
The video embedded in my PowerPoint presentation
does not play on the screen
Lamp won't turn on, Temperature light is on
Temperature light
Solution
If your computer is using the projector's DisplayLink
connector, see the DisplayLink User's Guide for video
troubleshooting information.
Turn off the internal LCD display on your laptop
Make sure vents aren't blocked, turn off the projector
and allow it to cool for one minute
24
Result
Embedded video plays correctly
B
Lamp turns on