I just built a new computer (first build) and everything is going surprisingly smoothly. But I have run into one issue: when I run the hardware monitoring software that came with my motherboard (a SOLTEK SL-K890Pro-939), everything is reported as being okay, excecpt for the voltage at the -5V pin, which is reading an average of about -3.8V (this value is displayed in red, and I assume this means that something is wrong). All of the other pins are reading safe voltages. Is this a serious problem? Am I risking damage to my computer by running under these voltages? The power supply I'm using is the 400W power supply that came with my case, an Antec Performance TX 640B. The computer seems to be running fine (although I'm getting bad perfromance because I'm currently using the default drivers).

Also, it might be worth noting that when I connected the power supply to the motherboard, one of the female pins on the power supply connector had no interior metal lining. There was a hole for the pin, but there was no metal lining to the hole, and all of the other holes had metal lining. I didn't notice the voltage of the pin.

Welcome to the PC Guide forums!

Also, it might be worth noting that when I connected the power supply to the motherboard, one of the female pins on the power supply connector had no interior metal lining. There was a hole for the pin, but there was no metal lining to the hole, and all of the other holes had metal lining. I didn't notice the voltage of the pin.
Probably is wired that way on purpose.

excecpt for the voltage at the -5V pin, which is reading an average of about -3.8VDon't worry about this one. Unless you spend $150+ on a new PSU, this particular voltage rail will always be a bit off. I've never had any problems with the -5V being off by that much, so I figure it's not that important! :p