I've got a 6 year old U2713HM that worked fine. Bought a new computer, Windows 10, and used the DVI cable for a few months and then changed it to Display port cable. Now, I randomly get a "Dell U2713HM Entering power save mode". I've tried updating the monitor driver but I'm still having an issue with the monitor going into power save mode. I've tried setting the Power & Sleep to "Never", but that didn't work too.
Well, I think I've spent enough time on the internet trying to figure out why my Dell U2713HM keeps going into PSM (Power Save Mode) when connected to a Display Port. Decided to go back to the DVI-DL to get the 2560 x 1440 resolution. I'm disappointed with this 6 year old monitor!