System won't POST, no codes

[reCAPTCHA]

I had been using my PC like normal (light gaming, basic CAD work), and shut it down before going to eat dinner. I came back (about 1.5 hrs later) and pressed the power button, and although all fans spun up, keyboard lit up, ect. there was no boot, POST, or even post codes..

I've taken it out of the case, cleared CMOS, disconnected SSD's, tried all possible RAM combinations, but I still can't get either a video output  or even a post code via the case speaker (but the keyboard still lights up and fans spin up, although that's expected).

 

Should I just assume that the Mobo is dead and get a new one? I highly doubt it's the PSU as it's the newest part of my system (<6months).

 

UPDATE: A friend came over with a known working GPU, and the system still wouldn't post with that.

 

Ryzen 5 2600 CPU

Gigabyte AB350N- Gaming Wifi Mobo

8GB Trident Z 2800 DDR4 RAM

Asus GTX 1070 GPU

Seasonic Focus SGX450 Gold PSU

 

 

Edited March 22, 2020 by reCAPTCHA
Added update