My Roku LE box turned off and won't turn on. It is less than a year old. I don't have a warranty for it. I unplugged it completely then plugged it in and it still doesn't work. What can I do?
If it's less than a year old then it should be under warranty:
Step-by-step instructions for returns and warranty replacements | Official Roku Support
If no light comes on when you connect the power then either the device is dead or the power adapter is dead. Try using a power adapter/charger from a phone or tablet.