[jaskerr]

That has not been my experience with Dell. My new UP2516D kept going black several times a day, with no apparent cause. I couldn't replicate the problem using the laptop with same DP cable, same laptop port on my wife's U2311H.

Dell customer support was hostile from the get-go, claiming "compatibility" problems with my MacBook. Compatibility? What could cause my laptop to be incompatible with the UP25 and yet compatible with the U23? Hogwash.

They finally agreed to exchange the monitor. They sent a refurb.

Since then, I've read multiple stories of people having problems with Dell monitors, using Windows or OS X. A common thread is the DisplayPort connection.