External Monitors Not Being Detected

[Rachel s5]

I have a Surface Book and have always used an external monitor for extra display. I haven't used one in a few months while I was renovating. I recently tried to use my external monitor, but now my computer isn't recognizing it. The monitor works with other laptops and phones, but not mine. When I plug in the HDMI cord to my laptop, it says 'USB device not recognized'. So far, I have:-replaced the HDMI cord-done a hard reset-done a factory reset-updated my drivers-checked the computer with other monitors and had the same issue-windows+pI've done chats with support, but they've been zero help an

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