The Xonar D2X I recently bought would only output digitally - the analogue output was so very quiet it needed my Hi-Fi separates amplifier on maximum volume to just about hear it.

The fix was relatively simple - it was all down to the cheap and nasty floppy power connector socket on the sound card - which had moved forward of the pins resulting in a partial connection.   The white plastic “socket” needs sliding back over the pins until it can not go any further - the floppy driver power cable then fits much nicer.  I’ve even put a tie-wrap around it now to prevent it sliding forward.

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