I'm sorry to hear that can I have your full model number to better assist you?
Please go to Settings>Support and provide the full model code and current software version. Have you tried plugging in the USB drive before turning on the television?
This forum is for the support of US products and customers. As your product is a non-US model and support for these models is very limited, please seek a support team for your area. You can do so by using this link: http://www.samsung.com/visitcountry Thanks!