How long exactly has it been since the units date of purchase?
If it's been less then 30 days I suggest you return it at the retailer you bought it for a replacement unit.
If its been more then 30 days, but less then 90 days, call slingmedia for a trouble shooting step though which can also end in a free replacement.
If it's been more then 90 days, then you will have to pay at minimum a $29.99 diagnotic phone support fee which will be refunded if it's found to be an actual hardware problem.
*They also sell an extended 3 year support option for 49.99 which one can purchase anytime within their initial 1 year warranty period.