I have an asus tuf gaming x570-plus board. Bought it in 2021 and never any problems. Last month I updated the bios to 4602 x64 since i was thinking about a new processor. Have use the computer everyday since and no issues. Bought a ryzen 9 5900x and installed it. It boots into bios and I can see the proc is recognized as is the memory, but I have no boot drives. I use a sabrant m.2 2280 1tb as boot drive and another Sabrant 500gb as storage. I have other various storage devices as well. Under advanced sata in bios, i can see the 2 drives connected to the motherboard, and m.2_1 and m.2_2 that if I click on either, bios asks me to change the name. Under onboard devices, all the pciex are listed as auto, including the sabrant drives. I can provide other bios information as necessary.
If anyone can help I would greatly appreciate it. I've been building my own computers for 15 years and have never come across this issue.