I am running Pinnacle Studio 14 for my edit programme. I have recently had my computer away to the man who built it for me to give it a health check and tidy up a few things. On return, I cannot get any sound from Pinnacle at all. Music does not play, videos run ok but no sound comes from them. The sound for my computer is fine. Windows Media plays and stuff on the internet plays so the problem is just with Pinnacle! I uninstalled Pinnacle and reinstalled but it made no difference, have checked all the audio devices but cannot find out what the problem is..........any ideas please

The computer engineer does not have a clue either as he has never used an editing programme before.