Very sorry to hear about this. Let's try a hard reset on your device: http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00047787&fm_seq=51904
I had bought Samsung blu-ray player BD-EM59C from USA. It had no prolems playing home video files stored in my external drive connected via USB to the player.
It had the firmware ver:1153
I upgraded the firmware to ver: 1157 which is available on the samsung website. The upgrade was done through the firmware update functionality available in the device which connects to the internet through wi-fi.
Now after the upgrade, none of my home videos are playing via the USB. The video is gibberish and audio has lot of noise.
Am not able to apporach the samsung support in India as this model is not available in India.
What can I do.