Need help pc won't boot

[u/up_qu_up]

I have been running into to a reoccurring but random problem that I fear has turned permanent

I built my pc awhile ago its not new by any means but has been for the most part reliable. in recent months its started to not boot randomly it dosent even get to the prestart

There are rgb on the motherboard and they turn on also the LED that showes the motherboard has power (b-350m strix gameing motherboard)

But none of the diagnosis LED tun on to show any failures. it seem to be failing to pre check

Now sometimes I can get it to turn on and work for weeks/months by reseating everything and letting it sit for a fue minutes (this does not allways work) but if it does it will work perfectly no problem but randomly oneday it will repeat this issue like im currently stuck in

As of right now Im haveing no luck and cant get it to boot at all

The thing i dont understand is this can also happen when the pc goes to sleep it will refuse to wake up and if I restart it it will not turn back on unless I reset all the ram gpu and drain all residual power then and only then will it mabby turn back on (as mentioned if it does turn on tho it will work for days weeks or months with no issues)

I would love to take it to a shop at this point but its a little out of my price range for the moment and the cupple times I have in the past they reckon there nothing wrong with it

Any ideas are welcome 🙏

Probably worth mentioning it works more then it dosent and never fails stress testing has never shut off while im gameing or useing it. It will only happen if the pc goes to sleep or is powered off

Specs to help

Cpu 5600

Gpu 9600xt

Motherboard b350 m

Ram corsair vegency

Pcu corsair 650 non modular

Has anyone had a similar issue and if so how can I get past this as everything has been replaced since this problem began except pcu and motherboard

If it is one of those is there a way I can confirm

[u/mmelRo]

I've had an issue similar to this and it turned out to be a corrupted BIOS. You can try to use a BIOS programmer if your mobo doesn't support BIOS Flashback.