An old ASUS motherboard here. The PC only turns on when the small 4-pin ATX12V ISN'T connected. The PC doesn't output anything from the GPU. Can't hear POST beep codes because this
Motherboard Beep Codes - Custom Build Copmputers
bios - supermicro motherboard, X10SRA-F-O , no beep no display - Super User
Pc starts, fans light up and spin, no beep, no signal, psu is not the problem, 2 things on the motherboard caught my eye, could this be an issue? : r/pcmasterrace
Identify Beep Codes - Operating Systems - Cisco Certified Expert