I bought the S500 projector for my wife to use in her classroom. The HDMI signal gets lost. One day she is using the projector fine and the next day it says it can't find signal for the HDMI source. She changes source VGA and it shows but when she goes back to HDMI it says there is no signal. I unscrew the side cable cover and remove the HDMI cable from the projector and push it back in and there is a "pop" and now it can find the signal. Then it works for several days and then it stops working.
Is something wrong with the HDMI cable or the HDMI connection or the projector or what?
BTW, Apple TV 3 is plugged into the projector with HDMI and she mirrors to the ATV from her iPad, if that makes any difference.