Edit 2: I decided to contact Best Buy and see about trade-ins, and discovered I bought the 4 year extended warranty!! So i got it exchanged for a "different" model... Which turned out to be the exact same thing just called something else.
First step will always be to try it with another computer/laptop/etc. The fact that you're not getting a menu doesn't bode well, though...
Is the screen black or is the whole monitor unpowered? It might be hard to tell the difference, but would be a good first hint as to what's gone wrong.
I have just plugged my monitor into my Nintendo Switch, and still nothing on-screen BUT sound comes through the speakers.
So that's a good sign.
I do NOT have the jog switch menu memorized so idk how to mess with brightness to see if it went to zero some how.
Edit: so I was able to find and download the user manual for my specific monitor. I have confirmed that the brightness is set to 100% because the backlight does come on. Will edit post with pictures.