Hello, ive come across this thread after pulling my hair out trying to set up not 1 but 2 systems. First up is a b550 MSI gaming edge wifi, 5800x, 16gb crucial ram with a gtx 960. Seems i have flashed bios successfully as i got the blinking light, then power cycled after 5-6mins. Installed the rest of the components as normal with the only slight curveball is i will be using an exisitng ssd from an intel system if that makes a difference. However the debug LED is stuck on boot with drive or no drive connected, but goes if i insert a windows boot usb stick but in all of these cases I get not bios screen, nothing from the display at all. I had all the parts for a second similar system being x570 tomahawk, 5900x, 32gb crucial ram, gtx 970 and a shiny new 1tb nvme drive. EXACTLY the same symptoms of the first system. After reading the posts I will try moving the nvme to slot 2 of system 2 (although this doesnt explain system 1), ive just watched a video where the 1st pci slot may have been faulty so can try that as well, I have a new b550 edge wifi coming tomorrow as well as a new ssd but after that im really at a loss. I used the latest bios available for both respective boards, should i try a previous bios? any other suggestions? The GPU definately works, same as the power supply. Unfortunately cant test the ram or cpu as im coming from and older intel build.