a few things to do when you have a major issue like this. First of all for no audio, make sure that you are not in Varispeed mode. This will disable your audio. Also make sure that you have set up the record enable to line or mic, and that you have your headphone mix set to hear your audio. Next if you are sure your settings are correct and you don't have a faulty cable go to the standard Red Glitch Fix. First power down the camera, wait a few seconds and start it back up. Think of it like a crashing PC when it does that sort of stuff. next if all else fails, reload the firmware. this can be downloaded from www.Red.com/support find your Build number (eg. 30.5.0) and follow the instructions to put it on an SD Card (1gig or smaller only). This is the Big Fix before things get sent back to Red for repair. Make sure to do a Black Balance after reloading the Firmware or updating it. I hope this helps.