Computer randomly dont post

[JohnnyCash]

So basically my new system has been running for a couple of days. Yesterday before bed I put a game to download during the night so I just turned off the screen and let the computer run during the night. 

Next morning, no post.

 

I tried all the steps from the pinned post but nothing of this works. 

 

My computer specs are:

 

Amd ryzen 5 3600

asrock b450 steel legend

corsair vengence 2x8 gb ddr4

asus 1060 dual 6gb (not new, from my old system)

ROG AIO LC 240mm white

be queit! 600w psu

the moniter is an acer kg271a

 

What I also tried was plugging in a secound monitor to the motherboard, no post. 

Any help is appriciated and happy 2021!