Jeebus f'ing hell, make sure you've got more than 18v DC driving the i-Opener. I'd set it up using a Targus universal adapter and sound worked fine. I hacked in a drive, chopped out various parts of the RF shield to accomodate it and a CPU fan and mounted the whole thing back together. On assembly... NO SOUND.
I used a different power supply after reassembly and it only puts out 17v. Everything BUT the sound worked.
Several days wasted time later I came across this thread:
I put the 19v power supply back, rebooted and voila, sound is back.
Now the question is where's the "best" place to pull out audio from it for feeding some external speakers? If possible I wouldn't mind using the front slider for control.