New device will not stay powered on

I did the factory reset 3 times this morning. But I had read somewhere press and hold the reset button for at least 30 seconds. During that time the device powered on then powered off again about 20 seconds later. 
I’ll read through the links you sent earlier tomorrow. I won’t be able to try anything until later in the day or even Friday morning. 

After 2 attempts to factory reset (both failed). I press the reset button, the device turns on and I get the bouncing Roku screen. I’m assuming this is some sort of Home Screen. But I cannot do anything. None of the buttons on the remote do anything. The remote works because my home theater system detects it. So I started from scratch

Following the connection guide on the TV, I plugged the HDMI cable into HDMI port 1 (2 & 3 used by my other devices). Then I plugged the other end of the cable into the Roku device. Again the bouncing letters but nothing else. 

I think it’s time to reduce my frustration and return this thing. The only time I was able to do anything with was the first time I connected it. I connected the WiFi and it downloaded a software upgrade. It hasn’t worked since. Albeit no error messages, I think the update failed to load properly.