You might try the troubleshooting guide and self-diagnostics in the manual to your Dell screen, here (p. 58): https://docs.rs-online.com/0b1a/0900766b813fac1a.pdf. I would expect it to be plug and play, but cycling through the monitor’s input modes might help.
Are you using a direct connection or a dock? I have intermittent problems running my Dell P2418Hzm off a StarTech dock (connected to a 14" MBP M1 Pro). I’m unsure if it’s the dock, but it seems likely. Sometimes a MacBook cold restart solves my issues and the monitor is suddenly ‘seeing’ the MBP again (or vice versa).
Thank you for the welcome! Sorry I forgot to add that important bit of information.
My new Mac is MacBook Pro 16-inch, 2021, M1 Max, MacOS Ventura 13.0.
It is kind of frustrating trying to figure out the monitor situation because Apple is forwarding me to Dell to solve the issue, and Dell just told me I am on my own because the monitor is old and out of warranty. So I am on my own, and I am placing my hopes in online forums.
Plus I am not a tech person though I appreciate technology very much.
Not sure if the new Mac and the monitor are compatible.
I need two monitors and one larger than 16", so that is why I am trying to make them work together. I would love to be able to afford an Apple display, but shelling money for the new Mac was pretty much an investment hopefully for the next decade (fingers crossed).
Kate - unfortunately, I don’t have a solution to your problem. However, I have a Dell P2415Q connected to my 2021 iMac and it works fine. I know it’s not the same monitor you have but I it’s probably similar, so I would think yours should work. Anyway, good luck with it, and welcome to the forum!
Before buying my current monitors I used a similar cable to connect my M1 MacBook Pro to a Dell U2518D monitor that has the same connector options as your U2415 monitor. Worked perfectly, no special display drivers required.