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Problem: System will not detect my standard SATA 3.5" hard drive.Problem: '''System will not detect my standard SATA 3.5" hard drive.'''Problem: No audio on system monitor.Problem: '''No audio on system monitor. Audio not captured.'''Solution 1:Solution 1: There is a single audio input, so only one camera with a microphone may be used, other cameras are video only. Audio is disabled by default. Open the menu:* Menu -> Encode There are two columns of options in this menu. At the bottom, the last row is labeled "Video/Audio". Check both boxes in the row. It is confusing that it appears there are 4 boxes and 2 are checked. Two of the boxes are not functional, they are graphic representations of a checked box. If all boxes are checked in the last row, audio will be enabled. Secondly, on the camera view of the main display there is a speaker symbol with a red line though it. Click the symbol, in the bottom left of the camera view, to unmute the volume. It is set to mute by default. Finally, ensure that all audio connections in back are correct. There is one RCA type mono audio in connector for the camera and one out for running to the monitor.