@TMAX837
Are you sure you are on the correct HDMI Input?
Try using the TV's remote (not the Roku remote), or a button on the TV itself to try and change the "Source" or "Input" to make sure you are on the correct TV Input.
Also, with the Roku devices, the Power button will only power on/off the TV. The Power and Volume keys are TV control and have no effect on the Roku device. In order to "wake" the Roku device, try pressing the Home button on the Roku remote and see if that helps get you a signal.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102