hi, my english bad sorry.... i have two computers and one of them gets this problem
When I watch a video on YouTube, it is not full screen. i use chrome, firefox, opera but all have the same problem. there is the same problem with different videos
i'd try, graphic card uninstall, reinstall
chrome delete and again installl
computer scan for virus and malware
I showed the error in the picture and
When I watch a video on YouTube, it is not full screen
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