Monitors suddenly stopped working. Please help!

I am using a dual monitor setup, with a computer that I have put together myself. I have tried using the tip that I've read about where you turn off the computer, power it off, unplug the monitors and after waiting a short while plug it back and turn the pc back on. But it didn't do anything.. I have also tried to switch from the Displayport, to a HDMI on a single monitor but still not working.
I have also considered that it may be my graphics card, though I do not think it's broken. the LED on the GPU turns on, stays on for 3-4 seconds and turns off briefly before repeating it over and over again. as far as I am aware this has never happened before with the GPU.

My graphics card is Gigabyte AMD Radeon RX 580 Gaming 8GB Graphics Card.
If you guys got any sugestions, or want to know any other information, feel free to ask and I will do my best to answer.

OS:
MICROSOFT FQC-09131 Windows 10 Pro - Licence - 1 licence ONLY - Download - 32/64-bit ESD - All Languages - (Software > Operating Systems) (64 Bit)

Storage:
x1 Samsung MZ-V7S1T0BW 970 EVO Plus 1 TB Solid State Drive
x1 Seagate BarraCuda 2TB Desktop Hard Drive 3.5" 7200RPM 256MB Cache

Power Suply:
Corsair (CP-9020084-UK) RMi Series RM1000i ATX/EPS Fully Modular 80 PLUS Gold 1000W Power Supply Unit UK - Black

Motherboard:
ASUS X470 PRIME X470-PRO Motherboard - Black

Memory:
Corsair 163301 Vengeance LPX 32 GB (2 x 16 GB) DDR4 3200 MHz C16 XMP 2.0 High Performance Desktop Memory Kit, Black (32GB total)

CPU:
AMD Ryzen 7 2700 Processor with Wraith Spire RGB LED Cooler - YD2700BBAFBOX

GPU:
Gigabyte AMD Radeon RX 580 Gaming 8GB Graphics Card

Case:
NZXT H500i Black with Red Trim - Mid Tower Gaming PC Case, Upto ATX, CAM-Powered Smart Hub with RGB LED Strip, 2x 120mm Fan - CA-H500W-BR

Monitors:
x2 ASUS VZ27AQ 27 Inch Ultra-Slim WQHD 2560 x 1440 IPS Monitor - Silver


Bellow I have take pictures of what the process of the LED lights turning on and off looks like. If you need any other info, feel free to ask.