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GPU or Monitor Faulty or Something Else?

Level 7
I was working on my desktop and suddenly i got a shimmer on the screen and the display went black with the no signal box came up from then i could not get a signal from Graphics Card to Monitor using DP or HDMI cable or to TV as duplicate display, However if I connect GPU to a DVI connection to a different 23inch monitor I get a signal. and a duplicate display on my tv via HDMI
I have connected a laptop at 1280 x 800 to my iliyama and that works fine monitor works
I had some luck changing the settings on my iliyama monitor to auto detect with the DP cable but after 1 minute the screen went black and no signal again,
Can anyone tell me what the issue is please as i am pulling my hair out is it the monitor or the GPU or something else, all are under warranty but i need to know what to send back.

AMD Ryzen 7 1800X / 8 Core - 3.6GHz
ASUS ROG Crosshair VI Hero
Corsair Hydro H100i
16GB Corsair Vengeance LPX DDR4 2666MHz
Samsung 500GB 960 Evo PCIe SSD
Asus GTX 1080 Ti ROG Strix OC 11GB GDDR5X
Corsair RM850x High Performance Power Supply
Iliyama 4k 40 inch Monitor
Seagate FireCuda 2TB 3.5" Hybrid Hard Drive - SSHD