A lot users have recently been reporting black screen while using their Xbox One. However, it’s not an issue with the console, it’s a service issue.
On Twitter, program manager at Xbox, Brad Rossetti explained:
Xbox One Users - we have identified the service causing the black screens and working on rolling back the service change - please be patient.
So, if you’ve been affected by this problem, don’t try to change anything on your Xbox One. Once Microsoft reverts the changes it made, the problem will go away automatically.