Crashes when projector Is hooked up

[handsomePATT]

Hey so on my pc I have two regular moniters. When I build my game using either the Launch button or Package button and install and run it, it works perfectly. But I tried getting it onto a projector for a demonstration, and now it crashes. It will only run if I hit play in the editor. All I did was unplug one of my moniters and plugged it into the projector. Any idea why this would be happening?

[handsomePATT]

I also just tried another thing. I had my two regular monitors plugged in. I recompiled and re cooked everything and hit Launch in the frontend, and it worked. I unplugged one monitor (So I only had one running) and that will also crash the build when I hit Launch. Is it a problem due to switching monitors?

[handsomePATT]

Sorry for posting so much, but I figured it out and thought I would share if anyone else has this problem. Basically what I found is since the projector used HDMI, but has no speakers, it would crash. When I used just my DVI monitor it would crash because there is no audio in DVI. When I use my HDMI moniter, which has speakers built into it, it would work. I figured this out because when I plugged headphones in while using either the DVI monitor or the HDMI projector, it wouldn't crash. But if I unplug my headphones it would crash, unless using my HDMI monitor which has speakers built in. There must be something requiring a UDK Build to have an audio output.

[Chosker]

yeah this has come up before. the game will crash if no physical cable or headphones are connected to the audio device's jack output.
this also happened to me using a 7.1 setup with just one of the output cables unplugged (which I had no way to plug because it's a 5.1 to 7.1 upmix)
for it to work I had to set up my audio to act like 5.1

I thought this was already fixed though, as I can play with 7.1 again without crashing

[handsomePATT]

Is there a reason for this? Or just a bug?