Hi all- first time posting, so not sure if this is in the right category but any help would be very much appreciated.

At a Youth Club, we're running the P Squared starter studio; SRM 9 channel broadcast mixer with Myriad software.  

Software boots fine, and carts play with no problems.  Desk seems to interface with Myriad properly (start buttons flash when cart is loaded and tracks can be played in Myriad via SRM).   I've checked that everything is plugged in properly. The problem is as follows;there doesn't appear to be any output whatsoever.  No level on the PPM meter (the PPM LED remains lit constantly) and no sound going to the studio monitors.  

The PGM button for the Myriad channels are all pressed in, the PPM is set to PGM and the studio volume is turned up.  Having only used this mixer once before I though I'd post here and read through the manual again before calling tech support.  The main left output bus has been flickering off occasionally over the last couple of days, so I'm hoping this has nothing to do with it and it's not a hardware issue, but I have a nasty feeling that the main output bus may have given up 




 Any solutions would be gratefully received!