You are using the supplied Dell DP -> Mini DP cables right?

I am indeed, just a single mDP to DP was supplied. The issue was there with just that cable and the Dell monitor connected.

I have since turned off DP 1.2 on the monitor and the issue has gone away. Problem is that my graphics card supports DP 1.2, so that shouldn't have been causing any issues. (Sapphire R9 290 Vapor-X)

Dell support were support to contact be back again today so I can update them, but never got a call.

I must say I expected better support from Dell. The fact this has gone unanswered for days is a pretty clear picture of the type of support that Dell seem to offer now.

The support I got from the phone service was even worse. I was sent a replacement which not only had the same problem, but had the worst back light bleed I have seen on a monitor. I was then promised a replacement would be delivered today. In fact I was guaranteed it would be so, but of course that wasn't true.

I may have to simply send this monitor back for a refund and be done with it.

Our priority is to try to answer the threads that have not yet received a reply. Most users with issues are not using our cable. They are getting the better StarTech cable and reporting success.

I can understand that, but I have not yet received any reply from Dell on this thread.

I have been using the included Dell cable, and then again the cable that came with the replacement. Both have the same issue.

Do you recommend sending the monitor back for a refund, as it doesn't sound like this issue can be resolved if your recommending me to buy a third party cable to fix the issue.

but I have not yet received any reply from Dell on this thread.
* I work for Dell.

A refund can be done inside the first 30 days from the Dell invoice date. Once past 30 days, all you can do is ask for an exchange. So it is your call whether you want to get an exchange or refund.

I'm aware you work for dell, but before you, no one replied from Dell replied. Your comment made it seem like someone from Dell had already commented here.

I can understand having to purchase a cable for a TV or monitor if the unit doesn't come with one, but the Dell monitor does come with one. If that is the problem, then by all means supply a cable that actually works, instead of suggesting I go out a buy another. Can you actually tell me straight up if the cable is in fact the problem, and if so, why would I continue to be given the same cable if it's not fit for the purpose.

"Can you actually tell me straight up if the cable is in fact the problem"

No. Just relating other customer experience.

I have had two U3415W monitors with this error. The first one went black for 1 to 2 seconds quite often, when a computer was connected to the DisplayPort (MacPro mid 2010). Not the other ports. Then I got it replaced but the second one had issues with the touch buttons (no touch sound even if it was enabled), so I got it replaced with yet another U3415W which I'm using now. Alas it too often goes black, when a computer is connected to the Mini-Displayport (MS Surface Pro 3). Not the other ports so I'm waiting so see what Dells comes up with now. It seems, that I get a replacement again, but I'm not sure. Awaiting an answer from their technical support team.

A colleague has two Dell U2414H monitors connected via Displayport to her computer. One of them also often goes black. Strange because we have never seen this issue on older Dell monitors. At our company we have quite a lot of Dell P2314H monitors running (via Displayport) which never goes black.

Right now I'm not using the standard Mini-Displayport cable supplied with the monitor. I'm using this one: www.av-cables.dk/.../premium-high-performance-displayport-kabel-2-m-8107.html One should think that this would be good enough but maybe not?

Regards

TGMadsen

Just to update.

This issue is with regards to most Dell monitors when DP1.2 is enabled. It seems the display looses sync with the output and has to re-establish a connection. This can happen randomly, but can increase/decrease depending on certain factors.

The downside is that this issue is with regards to the onboard PCB and how it was implemented. The monitor's board simply cannot handle DP 1.2. Again, just to note, this happens on all Dell monitors with DP 1.2 enabled, and is NOT isolated to the 3415W. We have personally tested 10 different Dell monitors all with the same issue in tow.

While this issue may not mean much to many people, as simply turning off DP1.2 will solve it. It does mean that the Daisy Chain function of the monitor will not work at all.

Dell's own support now suggests simply turning off DP1.2 as a solution to the problem, but fails to mention that any other displays connected via Daisy Chain will cease to work.

What can I say at this point?

Anyone reading this should NOT purchase a Dell monitor if they plan to use the Daisy Chain function in anyway. Their support on the subject has been completely absent and they have no wish to solve the issue either. I frankly can't imagine purchasing anything Dell related in the future. It's one thing to have a product that doesn't do what's promised. It's another thing to ignore the issue entirely. I really expected more from Dell.