AB350m Pro4 couse graphics card issue?

It may be possible that when the old GPU kicked the bucket it caused some damage to the board. Given your exhaustive troubleshooting I think you are on the right track with replacing the board. While there appears to be a lot of hate for the poor AB350 Pro 4, most of that was RAM compatibility related. I know many people that are quite happy with theirs, now 2 years on. I would recommend a 4xx series board as a replacement, newer and likely better compatibility with current and up coming CPUs. It's easy to get disillusioned with a brand after a bad experience but the simple fact is, bad components happen regardless of brand. Only if said bad components occur with unacceptable frequency do I usually write a brand off. The last time that happened for me was with Gigabyte in the early 2000's when they were hit hard by several bad batches of capacitors. Eventually they resolved the issue but not before it cost me a fortune in both replacement parts and lost clients.

Good luck and please let us know if the new board sorts you out, regardless of the brand you choose

Thanks for the response.
Contacted official Support, so we'll see what they have to say.

Like I said, not wanting to talk trash about ASRock, but this board, man...it's got me pulling out what little hair I have left.

I'm certainly willing to give an RMA a try, assuming it doesn't end up costing me what I'd end up spending on a new board anyway. :-/ I admit, though, I'm very wary now. I *want* to trust ASRock and chalk all this up to an isolated incident. Some of those B450 and X470 boards look nice, after all.

I guess I'll just use the X58 until I can get all this sorted.

(Oh, and my graphics cards didn't die....that'd be the OP. Best guess for me right now is that there's something on the board that's randomly losing it's mind and causing a power fluctuation, just enough to fubar everything. But I don't have the gear to properly test for that, and the nature of the crashes thus far has prevented me from getting any kind of a reading that might point to that with more certainty.)

Hi
So far, I did not have any more crashes, but still sometimes the computer does not turn off properly. Now I stop looking for causes until there are not crashes.

mati998 wrote: I have problems again. Probably I will buy a new motherboard and send this warranty, because I can not work on unstable computer...

My bet is on a dead mobo too.

Please let us know how it went, so we can learn the whole story.

Glad to hear everything worked out for you, eventually.
I ended up replacing my board as well...coincidentally also with an MSI B350 Bazooka. Looks good, runs good, and gambling on a cheap refurb made it...uhm...cheap. :)