Third display screen detected but not working

[Krista_272]

My boss utilizes his laptop (Dell Inspiron 15) with a dock connecting him to his monitor & his TV. He's been using this same set up for the past 2 years, but last week he unplugged his dock & since plugging it back in, he has not been able to get the TV display to work.We have:Ensured all cables are plugged in properly (same places they were previously)Updated graphics driver on his laptopCompleted most recent Windows updateVerified display settings are set to extend displayWhen in display settings, it shows that the third display is detected. The TV recognizes that it is connected to

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