Dell U2713HM screen blanks on web videos

After living with this for another week I now know that it isn't a web video issue. It can happen at any time, it happens probably about once every couple of hours, though sometimes it will do it a couple of times within a few minutes.

Also, it isn't moving the mouse or using the keyboard that unblanks the screen. It always blanks for the same amount of time, somewhere between 1 and 2 seconds. It blanks and if you don't touch the mouse/keyboard it unblanks again less than 2 seconds later.

I guess it might be time to contact Amazon for a replacement 😟

Presumably the adapter you are referring to is the DisplayPort to dual DVI adapter, which as far as I can tell has always had issues (which is the reason I waited until there was a decent affordable non-Apple 30 inch display with a DisplayPort connector, to avoid the flaky DP-DVI adapter).

I remembered that my Mac mini also has an DisplayPort. So I booted my Mac mini from my SuperDuper clone (what would I do without SuperDuper) and ran that for a couple of days.

I wasn't using it quite the same as my MacBook (I couldn't because the mini only has 4GB of RAM and so can't run my big Windows virtual machine). But in a couple of days of use there were no screen blanking incidents.

So I guess I can be reasonably sure that there isn't a fundamental problem with my U2713, there must be some sort of incompatibility between my MacBook Pro and the U2713 😟

That isn't true, DisplayPort is designed to support 2560x1440. It is DisplayPort that is used to connect to Apple's own display with the same resolution.

Do some reading before buying the Apple DP to dual DVI adapter, many people seem to be unhappy with it (one of the reasons I bought a display with DisplayPort).