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PC not posting cpu/dram debug light

Level 7
Hey guys i've recently built my first pc and been have issues with getting it to post properly, the specs are

CPU - Ryzen 5 1600AF

GPU - Gigabyte GTX 1660 super

RAM - G.Skill Trident Z Neo16gb (F43000C16D-16GTZN)

PSU - Corsair vengeance 750w silver

Motherboard - Asus ROG Strix b450i ITX

When i turn it on, previously i had a MSI B450i but that had cpu debug light so i switched to asus b450i and now the dram light turns on and no display, both times if i was lucky it would sometimes boot up and i managed to install windows and use it fine until i had to shut down which then again it would be no display and have to drain power and restart multiple times and it would eventually boot up

I brought it to a shop and the guy says its that i shouldn't use this motherboard with this CPU and should get a gigabyte b450i instead and that would solve the issue but i have a doubt that it is the motherboard as they are the same model?

I think it may be fault with cpu or ram as i have replaced both motherboard and power supply

but does anyone have any experience/knowledge with these parts any help would be appreciated thanks 🙂