The PC freezes to a complete blackout, what could it be, a PSU or a board?

Question

Iron

I have a working Ryzen 3600 on an Asus PRIME-B450M-K, got it when another 550 was prohibitively expensive. About 4 months ago, random freezes began, just spontaneously at any moment, in fact, there were only 3 freezes. For the first time, I encounter the fact that after a freeze, after pressing reset, a reset occurs, but no further loading occurs, the PC continues to hang until I turn off the power.

Hypothetically, I associate it with updating the BIOS, but I don’t want to roll back headlong, I’m not sure that such an effect can be caused by an unstable BIOS, and there is no mention of this on the network with this version.

The PC calmly passes stress tests, the video card, the processor are stably fried up to 90 degrees. PSU THERMALTAKE LT-650P, and he is already 3-4 years old.

The video card, as I understand it, can be excluded.

I hate computers :) Such things are difficult to diagnose.

Answer 1

Of course, it is difficult to diagnose, but there are no telepaths, but you could not clearly describe the problems.
1. How exactly does it freeze? the picture freezes and stops responding? Or maybe it starts to buzz strongly with all coolers? Or does the screen just go blank and nothing happens? Or the screen goes blank and the coolers turn off as a plus?
2. what does it mean

after pressing reset, the reset occurs, but further loading does not go

?
How did you determine that the reset occurred? has the sound changed? flickering screen? uefi boot messages/logo appear? Are the lights on the case flickering? Is a speaker connected to the motherboard and does it make sounds?
How did you determine that the download is not going? the screen is blank but the computer is buzzing? Is there a UEFI picture/text on the screen? loading stops at the Windows logo?
3. Are you sure that this is the case in the computer, and not in a non-working monitor, for example?

Answer 2

Maybe the SSD is dying?

Answer 3

Anything can be. Well, we need to find the reason. which causes a hang and then, reproducing a critical situation, test by changing components to known good ones.
Examples:
1. Once, a long time ago, there was a situation when the processor was the cause of the freeze - the computer hung when Cossacks was launched. With another process of the same model, everything worked, and on a buggy process, everything else worked too.
2. Recently they brought a rather old computer with a diagnosis of "slows down" and a request to do something. The hard drive there was just "at death". It was simply impossible to work. I replaced it with an SSD, it got much better, but it turned out that another problem was the same spontaneous freezes. Moreover, it was sometimes treated by resetting the power supply, and sometimes only by resetting the BIOS. I did not immediately understand what was the matter - it turned out to be in the BIOS. He was damaged. Fortunately, there were means for self-healing. I restored it, then updated it to the latest version and it became even better and without freezes.

Answer 4

Check the CMOS battery or replace it immediately.

Answer 5

The question can be deleted, it will hang like a dead weight without an answer. The board was replaced, the board was unstable with many settings tried. There are no problems with a new board (another model and another manufacturer) and the same other hardware.