I bought this projector and everything worked fine from the beginning. After 2 months there was a problem playing videos via MacBook Air, HDMI cable. Although it ran without problems until then. Video cannot be played with sound. Video plays choppy in quick succession and sound is unintelligible. If I switch the settings on the MacBook to play audio directly from the MacBook, everything is fine. I have tried changing the cable, playing a Youtube video and many other things. Nothing helps. When I play videos through the Apple TV, everything is fine, but when I take the projector outside, the sound just won't play through the projector.