I'm very sorry for any inconvenience this may have caused you. This sounds like it may need servicing. 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/
I have had samsung hw-c450 for over a few years now. Just recently it totally stopped working. The soundbar wasnt giving out any sound. I tried to do a couple restarts. So now what happens is still no sound. I turn it on and the screen stays on the HELLO for 10 minutes then finally changes to the DIGI 1. Even then no sound. And when i press Up or Down on the volume it is extremely slow to respond and nothing happens. Even when i press source button same thing. So I was actually able to perform a firmware update to the newest firmware. It updated successfully but still no change and still slow and no audio. Please help.