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On two of my Windows PC's, sometimes the computer won't even switch to HDMI regardless of how much I press the input button. Even after running a clean boot on both devices and seeing if any driver updated, I find myself stuck. The internet wasn't of much help either.

 

For reference, I have a 23" HP Envy and a custom built PC. It's the first time I (or my peers) have ever seen such an issue, so I thought I'd try looking on here for help.