Question Fresh PC build, no signal to monitor :(

Oct 6, 2020
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Hey,
I was looking for a bit of advice before my next step, which is to visit a PC repair shop. Long story short, this is my third personal PC build. I have quite a clear knowledge on building them and my previous 2 builds worked straight away. With this current build, I have connected everything up, the PC powers on but there’s no signal to the monitor. I have spent a few hours testing different parts. First I thought it may of been the CPU, as I left it run for a few minutes, and then looked at the CPU, the thermal paste looked unheated. I then ordered another CPU online, same problem, so it’s the not the CPU. Iv tried different rams sticks, even no ram sticks, nothing. I’m totally stumped.
Please can I borrow someone’s wise mind, i just want to get my moneys worth now and actually have a working PC :).
There’s no bios, I can’t hear any clicks when I plug audio in. Tried the monitor with my PlayStation works fine, also different cables
My specs are
CPU - Intel i5 9600k
Mobo - msi b365m pro-vh ddr 4 matx
Ram - Corsair vengeance 16gb 2x8gb
Ssd 500gb
Hdd 2tb
Gpu - msi 1660 super venture Xs oc
Case - cas-520 xigmatek
CPU cooler - aerocool Cylon 4
Psu - EVGA 500w