No HDMI/VGA Signal Coming From The PC

I built my new PC 6 days ago, and everything up until this point has been amazing. I haven't played any games until today, so my computer worked fine before. I decided to finally try CS:GO out and get 60fps for the first time. I played for about 30 minutes, and my monitor shuts off weirdly, and shows "No HDMI Signal Found", yet my PC was still on and I could hear everything. I restarted my computer and joined the match again. During my next game, same thing happens, but after I restart the computer THIS time, the monitor simply doesn't see any signal. I have a Ryzen 5 1600 and a PowerColor RX 570, but I think that the problem is in the motherboard itself, which is ASRock Pro4 B450. I am pretty sure that I have done the CMOS reset like it said in the manual, and I also tried using a VGA cable, but my CPU doesn't have integrated graphics, so it's useless to try plugging the input cable into the mobo. I really need all help I can get, because I have called 2 technicians, and all of them don't have a solution for me. I don't know if my motherboard is broken, or I'm doing something wrong.

Corsair CX550W. If it were my GPU, then i wouldn't be able to play CSGO for even a minute.