Brand New AM4 - Power On Pins Details £

==now without typing error===
To rescue an old AMD A6 9500 chip and a power supply with ATX 20 ATX pins, I purchased an AS RockA520M. Problem: not starting.

Is it right, that when the Power-On-Button is pressed (= 2 Pins at Panel1 are shorted), the motherboard should connect the Green and a Black cable coming from the Power Supply ?

I think so, because when I test the 20pins of the ATX cable with my multimeter, there are no voltages there if i do not short the green to a black cable with a little wire. And if they are shorted, than the Voltages come right and also the fan of the power supply is running.

But the two pins on the ASRock board, that shall be connected to Power On Button are not just briding the green and the black, which I tested too. Maybe they should and that is a failure of the brand new board ?

I am a bit clueless, have taken out almost all other components (not the CPU) and may just send it back to the seller.

Asked differently:
If the motherboard does not start the power supply fan, if the Power-On button works, then the mothermoard is broken,right ?

thank you, that is what I did not expect at all: that this nice CPU has no support anymore. Thus I will need to buy new CPU now.



Any suggestion for new CPU is appreciated, so that I can keep the ASRock A520 motherboard.

It should become a a BitcoinCore server ("Node") always online. It is recommanded high clock speed instead of many core and of course I dont want large electricity bill.

I don't know about Gigabyte, but AsRock's BIOS download page explicitly warns you of this. For example: "*This BIOS doesn't support Bristol Ridge CPU, do NOT update this BIOS if Bristol Ridge CPU is being used."

Anyway, the oldest I'd go with is Zen2. Something like a Ryzen 3 PRO 4350G (if you can find one) would have very low idle power consumption, because it's monolithic. Beyond that, maybe Ryzen 3 3100 or 3300X, but those are likely even rarer than the 4350G.