Thanks for reaching out to the Roku community!
I'd be happy to take a closer look to see how we can help. Can you please provide us with more specific information about the issue you are experiencing? Is there a light showing on your device? How are you powering the device? Is it plugged into the TV USB port, or is it plugged into the wall outlet with the provided cables? In addition, have you tried using another HDMI port on your TV as well as trying your device on another TV to see if you are seeing the same issue?
To help troubleshoot the issue further, follow this link: What to do if your Roku streaming player will not power on | Official Roku Support
Please keep us posted and we'll continue assisting you from there.