Question Monitor randomly goes black but can still hear game, whats going on?? HELP!!

Jul 3, 2020
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So this has been happening ever since my PC was built. (A lot less so since i started using 2 HDMI cabels) I'll run you through what happens

1. I'm playing a game (Usually League of Legends but this has happened during other games)

2. I'll be playing normally but then my screen goes black like my monitor has turned off, i can still hear my game and my friends on discord but they can't hear me.

3. the only way to fix it is to turn my PC off at the power switch, sometimes my fan speeds up but that doesn't happen everytime.

I seriously need help, this is hyper stressing me out. Do i need to buy a new graphics card?

Specs
CPU - AMD Ryzen 5 2600 3.40GHz
RAM - 16GB DDR4
GPU - GeForce GTX 1060 3GB
PSU - 550W