Question No display but the system is running

Aug 16, 2021
14
1
15
0
System
Ryzen 5 3600
Asrock steel legend b450m
Pny 3200mhz 8x2
Rx 570 4gb
Gigabyte 650b 80+ bronze

After i replace a stock cooling to id cooling the pc is still fine and shutdown in evening after that i open my pc in morning i only get a no output and enter sleep mode in monitor but i can shutdown the pc using keyboard (alt f4) and i can refresh pc then i check my system if all are connect but no problem the rx 570 fans so i tried to reseat all component and before open it only monitor and power are connect but same problem again
My thoughts the problem is the gpu bcz this is the only 2ndhand component in my pc
 

ASK THE COMMUNITY