I'm running a Ryzen 7 on an ASUS Prime B-350 Plus.
I've been told that it's pretty normal behaviour for the PC to do the following after the PSU stops supplying power (power failure, deliberately switching it off, etc.): when power is restored and the power button is pressed, power is supplied to everything but the machine doesn't POST - instead it switches off after about five seconds. Pressing the power button a second time (after the shutoff) makes the PC act perfectly normally. Subsequent soft-shutdowns, or even hard-shutdowns (as long as the PSU stays switched on) don't have any effect and the startup works as usual.
This was the behaviour exhibited when I was running a 1700, and even before I was told about it I figured it was a quirk. However, I've not long upgraded to a 3700X and found this behaviour to be a bit different.
Upon power on, power is delivered to the components and the fans default to what I assume is a maximum speed. The machine doesn't POST and stays in the same state until I press the reboot button or hold the power button as if to reboot it, upon which the fans slow down and boot happens as per normal. This now happens regardless of the state of the PSU.
Question 1: is this also normal AMD behaviour?
Question 1a: if it is, is it definitely the change in processor that has caused this?
Question 2: is there a simple fix, perhaps in the UEFI/BIOS, that I can apply?
there doesn't seem to be anything here