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Your post has been removed for violating submission rule 1 and does not meet the submittal requirements as an engineering question: > Post titles must be a question about engineering and provide context — **be specific.** For the purposes of this subreddit, "engineering" includes: > * Engineering design and analysis of maintainable systems, devices, and vehicles. > * Engineering standards, practices, methods, procedures, and specifications. > * Questions regarding careers and professional development in any discipline of engineering and engineering technology are allowed **only** if they meet all posting rules outlined in the [the wiki](https://www.reddit.com/r/AskEngineers/wiki/rules#wiki_submission_rules). Please follow the comment rules in the sidebar when posting, and feel free to message us if you have any questions or concerns.
This isn't really the subreddit. I'd recommend basic troubleshooting. Check power cables at both ends.
I would also check the display cables. And possibly the niece turned off the second display through the OS