The manual is here...
http://www.pioneerprodj.eu/eur/products/42/99/S-21W/media.html
Flashing Blue is not defined in the manual.
Have you tried changing the Auto Standby switch to ON?
You can prove if the sub amp will respond to a known good input by TURNING ITS VOLUME DOWN tp start and just feeding it ANY RCA output from the receiver while playing, say, FM (to keep it simple). That way you would known in which direction the problem actually lies (internal or external).
My sub was playing just fine until I moved to a different location. Now I don't here any sound at all and everything is hooked up properly
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