What is the model number of your Roku device and the Software build number? Both of these can be found under Settings/System/About.
When you say "...hooked up the Roku to the only HDMI port that would accept it which was HDMI 4", do you mean that was the only available HDMI port or that HDMI 4 port was the only port that the signal would work on?
Try connecting the power cable to the wall outlet for power, and try using a different HDMI cable. (or at least make sure the HDMI cable is firmly seated at both the Roku device and the TV. When you select a channel/app and you start to hear audio, try unplugging the HDMI cable from the TV and reinserting it to see if picture now becomes available.
Do you have another TV you can try the Roku device on?
My Roku devices are working on TVs much older than yours, so filling in some of the missing information from your posting above will hopefully provide some insight.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941