Hi all, a bit at my wits end with this. Specs: MSI B450M GAMING PLUS AM4 DDR4 mATX Motherboard Ryzen 5 2600 AM4 Processor Sapphire Pulse Vega 56 Corsair Vengeance LPX 16GB (2 x 8GB) DDR4 PC4-19200 2400MHz WD Green SSD 240GB 2.5 7mm SATA Gen 3 WD Blue 1TB 3.5" SATA Desktop Hard Drive Corsair TX550M 550W 80 Plus Gold Power Supply I carried out a couple of upgrades over christmas, I changed the stock wraith CPU cooler to a Noctua cooler, I also changed the PSU to an EVGA 850w G3 80 plus Gold, this was at the same time. I had a bit of trouble getting the cooler backplate on and it fell down the back of my motherboard a couple times. When I turned it on it would only boot to bios and would not detect either of the SATA drives, tried CMOS reset with no luck. I do not have another PC to test the drives on. It would also show only half my RAM on the bios, following the CMOS reset it briefly showed the full 16GB, then back to 8GB. Now the computer will not even boot to bios, nothing. It was in perfect working order before I changed the cooler and PSU. I tried changing back to the old psu, change sata power leads etc. Should I try replacing the motherboard? Many thanks.