My new PC won't work anymore (it did yesterday)

[Damihan]

Hello,
so I got yesterday my new gpu (Gigabyte Gaming G1 1060 6Gb) and I plugged it in my new pc build which I had at home for a week now.

• 
  Cpu: i5 6600k
  Gpu: Gigabyte Gaming G1 1060 6Gb
  Cpu cooler: Cooler Myster Hyper 212 Evo
  Case: NZXT 210 Elite
  Memory: 1x8 Gb Kingston HyperX Fury Black DDR4 8Gb 2133 MHz
  SSD: Samsung 850 Evo 250Gb
  HDD: Western Digital Blue 500Gb
  Motherboard: Asus Z170 Pro Gaming
  Psu: Seasonic S12II-620 620W
  Monitor: AOC I2481FXH 24"

I connected my monitor with my gpu with HDMI cable. Everything was fine I got into Bios, I started installing Windows 10, still fine, when the instalation finished I have got to my desktop I changed my screen resolution (it was like 1024x768 or something like that) and then i restarted my PC. After that nothing happened. When I turn it on nothing hapens, fans starts to turn, motherboard start shining, gpu starts shining but my monitor gets no signal and I have no idea what to do. The thing that confuse me is that it was working yesterday before restarting and then nothing. I didn't changed anything. I didn't do anything different. I would get it if it wasn't working at all, some unplug cables, some stupid thing I overlooked, but it did work.
I am prety desperate here and I would really appreciate some advice. Thank you for responding

 

[alexoiu]

Hi, If removing the graphics card and connecting the monitor to the board, still the same?

 

[The Paladin]

plug monitor into the main motherboard , does it show anything
I will ask, some monitors have dual inputs, and you have to select the HDMI/DVI/VGA signal manually to see something.
are you on the right signal post selection?

 

[Damihan]

Thank you, I removed gpu, and it worked now it works even when I put gpu back in.

 

[alexoiu]

You're welcome.