So I am in the midst of building my friend a computer, using an RX 570, an athlon 240ge, and 8GB of ram, on an asrock b450 hdv r4.0 mobo. however, we couldnt get a post when we powered it on. I have verified that the all of the parts in the system worked, by switching out the athlon for my ryzen 5 1600, and put his athlon into my system. both systems booted with each others CPU's, so I assumed that the b450 board must have had an old bios that did not support the athlons. however, once I updated the bios to the latest version and returned the athlon to its original motherboard, there is still no signal from the monitor. please help.