Hi there. I got a gift from a relative of, a AS Rock B450 Pro 4 MOBO nad Ryzen 3 3200g processor.I had a very old casing in which an old core 2 duo with its Mobo was fixed. I removed tha, Put this Mobo in with the ryzen 3 and the fan etc. the mobo has a power supply 24 pin slot ( the big one). I had a power supply which has 20 pin thingy. so i tried to put that in the mobo, it went in easily leaving 4 holes empty. Ialso plugged in the other 8 pins at the other slot required. I connected the power cable, vga cable etc, but no activity. not even the cpu or PSU fan moving. No beeps coz of no speakers. So do i really need a PSU with 24 pins?? Plz guide me.