your computer presentation includes sound and you did not connect
it to the projector's HDMI
you can still play sound through the projector's speaker system
. Just connect an
optional 3.5 mm stereo mini-jack audio cable as described
Note: If your
projector does not have an internal speaker system (Pro L1405U/L1500U/L1505U), you can play sound by
connecting external speakers to the projector.