Black screen Gigabyte ab350m - gaming 3

[gludio1234]

hi , i recently i got myself a ryzen 1200 and a Gigabyte ab350m - gaming 3. i get random black screen like 4 times a day with load (playing games) and no load. it is very random 15 min.- 3 hs. i updated all the drivers , the bios check the temps and still happening. i have an old gpu 6850 hd 1gb. when this happen fan coolers keep running , sound just crash and i have to press the restart button. Also mouse led goes off. im thinking that is the Mobo but i dont have other hardware to test it. what do you think? also no OC and ram 4gb 2400mhz running by default at 2133 mhz i didnt want to touch anything until i solve the problem. Psu 500 W

 

[Calvin7]

AMD Ryzen 3 1200
Supported memory: DDR4-2666
No sense in running at a 2133MHz if you have DDR4-2400.