Do you have only 1 display adapter listed at Device Manager?
I remember once I had a similar issue caused by a citrix virtual display adapter which used XP model driver and it turned out Windows doesn't support XP and WDDM display drivers at the same time.
Also, I had an issue with my D54250WYK displayport being not able to resume if I change my monitor to another video source and then back to displayport. It was fixed by latest driver, with build number 3379, so maybe worth trying to update driver. I think this driver was installed by Windows Update because it is not listed at Intel`s support page.
I am running Windows 8.1 Pro 64 bit.
When the system crashes as you say, are you getting a BSOD or it just freezes? Can you also post your dxdiag report here?
When I mean the system crashes, the system just powers off, I do not see a BSOD at all. Also I'm not sure how to attach the dxdiag to my current post so I will attach to my original post.
@ yigi - Yes I only have the single display adapter list. I have also tried to download the 3379 driver manually but seems I am not able to upgrade to it, I guess it may be for Windows 8 and not Windows 7.