I'm sorry to hear that you're having this issue.
If DVDs have been unable to play, even after a firmware update, the unit may require service.
You might try resetting the unit by removing any discs in the tray, powering it down and powering it back up and holding down the FF>> button. If discs still don't play, you might call 800-SAMSUNG and have the unit set up for service.
Initially, my HT-BD1250 would not display the menu screen of many DVDs and only the disc's audio could be heard. Despite the absence of the menu, some movies would play when the play button was pressed. In an attempt to correct this problem, firmware update BEv2.41 was successfully installed. Now, unit will not play DVDs...including those that previously played without any problems. Intermittently, the unit will exhibit various problems with the same DVD. Sometimes, audio can be heard but video signal cannot be located. Other times, a vivid pink screen appears. Still other times, there is no audio and blank screen indicating video signal cannot be located. After very thorough testing, there appears to be no pattern in which problem occurs. Blu-ray discs appear to play without problem. Any information and/or assistance in resolving this issue would be appreciated.