Hi @Okiro89 ,
A warm welcome to the Roku Community!
We understand that you are facing an issue casting your PC on your living room TV, and we appreciate the troubleshooting steps you've taken in trying to resolve this issue. We would like to know more about how we can help, but we need more details. What Roku device are you using right now that has an issue? (e.g., Roku Express, Roku Streambar, Roku TV—specify TV) Are all your Roku devices linked to one Roku account? Also, are all the devices you are trying to cast connected to the same network?
However, you can check which Roku account a device is linked to by checking the email address on each device displayed under Settings->System->About.
Please keep us posted with the above information, and we will continue to assist you should you need further aid.
All the best,
Chel
Jecheal R.
Roku Community Moderator