Question Black screen

Nov 20, 2019
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I build this Pc to my brother 1 month ago :

case: Cooler master masterbox lite 5
psu: Corsair CX Series CX450M
mobo: Gigabyte B450M DS3H
cpu: AMD Ryzen 5 2600
ram: Corsair Vengeance LPX 8GB DDR4-3000MHz
hdd: Western Digital Caviar Blue 1TB
gpu: AMD Radeon RX 570 8GB ( its connected with hdmi to vga adaptor to the screen)
4 fans to the system

When i install all components, windows gpu drivers i test the system to see if its ok and was OK.
Before 5 days he told me that. While he playing after some time have black screen and pc working. Any idea what happening ?