Hey just building my fist pc. Went cheap so got a second hand case with a prime a320m-k and vs450 power supply. Bought a new athlon 3000g , 16 gb ddr4 vengeance pro and a 250 ssd . All wired in went to power it up and have no souce detected on sreen. Iv tryed reseating ram, 1 stick at a time in bith slots still no signal. Can anyone help at all