Really ???? you have a problem each hour XD hahahahahaha R// (windows+P) = duplicate image

Not sure what that comment is about, but still looking for any help.  Thanks.

Spaceengineer,

I would recommend you to uninstall the video card driver and download the latest version you find in the Dell support site or the NVidia website and install it.

Please let me know you it goes. 

Milena,

I did as you suggested and the monitor still won't work when connected via Displayport.

I currently have it working by using a mini-displayport to dvi adapter.  I have tried two different displayport cables from two different manufacturers and when connected they both cause the same errors.  Both cables work fine with my mac.

I have one more to try, ordered an xfx active adapter.  It comes today and if it still won't work then I will need to initiate a service call.

Yes please let me know how it goes with the new adapter.

As well have you notice if you are able to change the resolution manually and what happen if you select extend the monitor instead of duplicate? 

The new adapter did not work.

I have tried extended, duplicate, even setting the external as the only monitor.  Nothing takes.  The external monitor shows "No signal".  The option to change the resolution is grayed out for the external monitor.

The only option that works to connect to the monitor is HDMI or to use a mini-DP to HDMI or mini-DP to DVI.  Frankly, these options will work for me, but I am concerned that this indicates something is wrong with the computer.

Please advise on what I should do next.

One thing I did not see suggested was reinstalling the Intel Graphics Driver. However, when uninstalling the iGPU driver, you should uninstall the Nvidia driver too. Just to prevent problems. This would mean that you would have to reinstall the Nvidia driver, but it shouldn't matter which one.

You can either get Dell's latest iGPU driver or Intel's latest iGPU driver. I have found Intel's own drivers more stable than Dell's.

Thank you for the suggestion, however I already tried that.  Notably, the latest Intel drivers cannot be installed on this system.  Lately, Intel has begun checking hardware and will not allow the installation of OEM drivers on certain laptops.  The installer refuses when you try.

As for the NVidia drivers, I always use the latest from their site.  Just in case, though, I tried several versions both OEM and Dell.  Since this computer has Optimus technology I am thinking that the problem lies in the Intel hardware or software.

At this point, I am pretty sure something is amiss either with the computer or the monitor.  Since I don't have another monitor with DisplayPort to test, I am stuck.