CPU fan spins then stops on startup & keyboard/mouse/monitor don’t work

[jasonduke]

Relatively new to PC building. I just upgraded my motherboard and cpu today and performed a BIOS flashback to update the new motherboard to support the new 5800x cpu. I waited till the flashing green BIOS light turned off, indicating it had been updated, and started my computer.

The computer turns on, the cpu fan starts up for a second then stops, the keyboard/mouse/monitor do not work. When turning the computer off, the cpu fan starts up again for a second then shuts off again.

Specs: •Ryzen 7 3700x    Ryzen 7 5800x

•Asus Prime A320mk    Asus TUF Gaming b550M Plus

•16gb ram 3000 DDR4

•GeForce GTX 1650 X 4GB

•500W PSU

Any suggestions on what to do? I’m not sure if I’ve messed up somewhere or missing something?

[Skiiwee29]

How long have you tried or let it go? This sounds like normal Asus while it trains everything. Can take a few reboots itself and a few minutes of doing this.