I recently purchased this blue ray player, and have successfully watched a dvd, however, tonight I tried playing the movie 'The Green Hornet', and although it displayed video, it was not playing any sound. i could not work out what the problem is. I noticed some other Phillip Blue Ray Players had issues with certain Blue Rays, especially those with DTS. Could this be the issue? does it not recognise certain Blue Ray's? .appreciate if anyone can assist.