Help! My motherboard won't post unless I use a power supply that has a -5v pin in the 24 pin connector. I just built this rig and it's all brand new stuff. Why do I need -5v pin when that was outdated 4 years ago? Is my motherboard messed up? Build is above mobo-OCZ platinum 2 x 1g memory, amd 6400+ cpu, GIGABYTE GV-RX385512H Radeon HD 3850 512MB video card, 650 watt coolmaster psu....not installed due to posting problem, I have an aspire 680 watt psu that has a -5v pin installed right now so I can use it.
You're right. You seem like you've got it figured out already. It would be interesting to get a confirmation from another owner of your motherboard. But, you'd think there would be complaints on it's feedback page.
Motherboards don't usually require the -5 volt pin anymore. I don't think any new motherboards require it for that matter. And if it did it should've been specified in the specifications page. That's very odd.I would contact the manufacturer and see what they say about it requiring a -5 pin.
You should probably return it to Newegg.
If it does require a -5 volt pin the manufacturer should be slapped upside down, up and all around and I would have Newegg send you a shipping label for an exchange for another motherboard. I certainly wouldn't keep a mobo like that.