24 Pin ATX issues and troubleshooting
24 Pin ATX issues and troubleshooting
I’m trying to figure out why a specific pin in the 24-pin ATX socket isn’t connected properly—it’s missing continuity with the rest of the board. This wire, likely the -12V or blue one on the 24-pin connector, is probably there for power delivery or grounding purposes.
There's a pin that's not used anymore in the 24 pin connector, but it's actually -5v . It was used in the past in ISA slots, so it's no longer needed... it got deprecated in the latest atx standard specifications. -12v is still part of the standard, but probably nothing bad would happen if it's missing, and it wouldn't surprise me if some motherboards don't connect the pin in the header to anything. It's only used for serial ports, for example if you connect your computer to the serial port of a network switch with management instead of using web interface or whatever. A lot of motherboards don't have those serial ports on the back, only as headers or none at all ... and there's lots of usb serial adapters these days.
Yes, you shouldn't worry about the pin if the system still gets power to fans but not USB or display.