Hi - I have just bought the LG HT552TH DVD and surround sound system. I have it connected up and get great sound in 5.1 when playing a DVD. I have my PS3 connected via an optical lead but when I switch to aux I get no sound. I have the PS3 set to optical audio out too. I also have the same problem with my TV which is connected through red/white audio leads to the aux in sockets. I have tried connecting only one at a time and I have tried the optical lead driect from my HD digi cable, still no sounds on aux. Can anyone help?