Hello, I was wondering if somone could help me to figure out why this 12 volt pins overloaded and failed. I have looked up the pins and figured that out that the pins are 12 volt. But I do not know what those sockets power up. I am concerned that if I get the motherboard repaired that the overload would happen again. If I can figure out what caused the overload I can replaced said item(s). I know this system is a bit dated but it works very well for what I need. Also I do not overclock the system because I have no need to do so at this time. I did not get any warning. The system was not running when I walked in the door after work and would not power up when pushed the power button.
 
Thank you inadvance for any help.
 
Here are my specs.
Tower:Storm Sniper Black Edition
GPUS:EVGA GeForce GTX 560Ti Ultra Classified 448 Cores in SLI
Sound Card: Blaster X-Fi Xtreme Audio
Motherboard:EVGA nForce 780i SLI FTW
CPU:Intel Core 2 Quad Q9650 YorkField @ 3.00Ghz
RAM:8 GB OCZ Reaper
BUs Speed: 1999.9 MHz (6.0 x 333.3 MHz)
Keyboard: Logitech G19
Mouse: Logitech G9x
Headset: Sennheiser pc350
 
Here is a picture of said damaged to the motherboard.

Yep..The burned +12V terminal is one of the feeds for the PCIe slots..Usually caused by a poor connection (partially backed out terminal, or whatever) there from the PSU..Can be caused by a modded VBIOS or GPU overclock that allows too much current to be drawn..Better check the PCIe edge connector on the graphics cards and their PCIe slots too for signs of burning/overheating.

Some mobos have an additional 4-pin Molex for supplemental power to the PCIe slots but your mobo doesn't..EVGA sells a little doodad call an EVGA Power Boost that supplies supplemental power to the PCIe slots and takes some load off the 24-pin connector's PCIe terminals and that is what you should consider getting if you can get the mobo terminals fixed..Prolly need a new terminal or two on the PSU-end also, or a new cable if it's modular, or another PSU.

biscuit1
I lost a 750i sli FTW board the same way . Check your psu pins to make sure they aren't also burnt . Does that board have the additional 4 pin Molex near the pcie slots ? It was a knows issue on the 700 series boards from evga . Other manufacturers had them on theirs , but evga skimped on it . Oh , they'll sell you a power adapter to stop it from happening , but no warranty help . Were the two cards overclocked by chance (more than the factory o/c) ? Also , what brand/size psu were you using ?  

Sorry I should have listed more information about the PSU. I have uploaded several more pictures. Yes the PSU had two pins damaged, the cards where not overclocked at the time of failure. Silencer 750 watt Quad Blue.
 
So what I am learning is that the Graphic cards pulled to much power into the PCI power express lanes causing a thermo event. Well that is a relief in a way at leaset I know caused the issue. I did inspect the cards and did not see wear on them also the dust was a bit heavy that could have contributed to some of the failure.
I would like to thank everyone who helped me figure out what caused the failure. I can now rebuild the system with replacement 790I motherboard I bought along with the Power Boost to help keep the power hungry cards fully fueled.
 
I can not find anyone who will touch this motherboard to make any repairs. I called 5 diffrent local computer repair shops and they all told me I was crazy. I am thinking about buy the parts and fixing it myself just for fun and to see if I can repair the board. The PSU can be fixed and will be reused.
 

VegetaCreeper
If I remember right, that motherboard from Evga came with a lifetime warranty didn't it?

You are very correct! I contacted EVGA support and they told me it is covered. They will replace the board "if" I can find my original invoice. I say if because I bought this board over 10 years ago. The funny thing is I think I still have the invoice some where in my file system I call random box of computer items.
Thank you for reminding me this can be covered by Warranty!!! 

In 2011 they replaced my 680i with a 790i. Be interesting to know what you get in return.