You can reset the bar by disconnecting it from power for several minutes. If the problem persists, it may need service. Here's the thread where you can get details on setting that up: http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/
Please can you tell me how i save all the settings i have set up on the sound bar, i have changed the dimm function the sound options, but when i turn it off and back on it has not been saved, its becoming a pain now. it also changes to D-IN every now and again, i then have to change it to HDMI1.