Meriussss

Ive just built my first pc and it worked perfect for the first 2 days but after spending like 45 minutes on it the 3rd day monitor goes to sleep and says displayport no signal i restarted the pc and it worked for 30 minutes then again monitor went to sleep if i try restarting nothing works i tried the monitor on another pc and it worked fine so i guess its hardware related problem i tried using both hdmi and display they dont work i tried without the gpu (rx 590 fatboy) checking both ram sticks 2x8gb 3600mhz they work well.... i think.... i removed the mobo battery (gigabyte b450 gaming x and cpu is ryzen 5 3600) for 30 mins i checked the cables a million times i dont know why its not working the PC boots up but dosent send signal to monitor restarting also dosent help ( very rare it works but then the monitor shuts down in like 5 mins) i dont know what to do anymore so specs are windows 10 64 bits updated rx 590 fatboy 8 gb ryzen 5 3600 mobo is gigabyte b450 gaming x 2x8gb 3600mhz ddr4 ram from viper psu is corsair cv650 650W cpu stock cooler uh after opening the pc the only driver i installed was the newest gpu one and windows updated itself i want to update the others but i cant see anything on my monitor i also dont know how to enter bios or if it would help