I have connected Explorer 4250 HD TV box (Scientific Atlanta) by coax cable to Samsung Smart TV, instead of HDMI. Everything seemed OK for one day. Then the HD box started recycling "boot" and code -1111-. I switched TV box power off/on again, but the TV box continued to recycle. The Customer Service told me that they cannot do anything, and the box is defective, which i doubt. Can you please help me out with a bit of diagnostics. (1) Is it OK to use coax as output from HD box to the TV (the box has HDMI output, but I did not have an HDMI cable)? (2). What is the code -1111-? (3) Any suggestions, explanations, advice will be highly appreciated. Thank you very much.