7990 Display Query

[Idleman]

My Gigabyte 7990 has stopped displaying via DP, but I can still get a display using the the DVI-I port. What could be the cause of this? Is it the card, the DP lead or the monitor? I have tried to use a DP-HDMI lead in the past to connect to my TV, but could'nt get a signal and searching the web, it seems hit and miss as to whether it works or not.
Any help appreciated, gaming at 60Hz is not the same as 144Hz.

 

[africanos23]

It might be the drivers if you have updated them recently. Try a new cable though and move from there.

 

[Idleman]

Just tried another Gpu(GTX770) and a different cable. Still no signal via display port.
So, I assume it is an issue with the monitor and not Gpu drivers or the Gpu.
Just want to be sure before arranging an RMA with Asus.

 

[slick rick]

Have you tried turning the monitor off at the mains for a while? I remember I would occasionally have an issue with my PS3 back in the day where it was a 'handshake' issue using HDMI and powering off the TV at the mains would resolve it. I am not sure if this would work with DP but worth a try?