hello there, i have a B450M-Pro4 board here that wont power on
3.3V on PowerOn Pin is ok, but when i pull down - the system wont power On. The SuperIO (NCP...) will not pull low the PSON pin, so the powersupply will not shift in on state.
When i manual pill low the PSon Pin - the powersupply starts and all phases works, voltages are all in rage, but board will not boot. When i leav the PS on Pin on ATX plug (the green wire) the board goes instantly off.

Error happens after ram remove. After ream remove - the board was in this "dead" state. But what can be happened here? What can i check?

https://download.asrock.com/Manual/B450M%20Pro4.pdf
Check battery CR2032, clear CMOS

xD already checked and bios was reset.

Clean contacts of RAM memory modules, return back RAM menory on board and check power on

mia
наличие или отсутствие памяти на включение не влияет.

Assassin
Asrock boards without a processor do not turn on. Do you check with or without a processor?

Computer components are sensitive to static electricity. Before touching any of them, touch the power supply housing to discharge static charge from your body.

i testet it only without Processor...but all my other boards (also ASROCk, but intel boards) can turn on without cpu.

but ok, i will test it...i must only find my old ryzen 1600 cpu...
ill be back later