Melted atx contact, what to do?

[torsrex]

Hey!
I have a gigabyte x58a-ud5 and a Corsair HX 850w psu.
Recently the computer have been randomly shutting down, without any error or bluescreen. I found a solution which involved reseating all of the cables in the case. That's when i found out that the main atx contact both from the psu and on the motherboard is melted. I tried removing plastic from the contact and bending the contact a bit for better contact and my pc hasn't crashed since. My question is: what is it to blame? The power supply or the motherboard? Should I send something in for warranty, if so, what? The pc hasn't been overclocked in any way and it is built by me. All of the parts are also bought from the same supplier. I had recently an ati radeon hd 5870 which got broken, but I got a replacement card. Maybe this is the problem?
Also, the voltage readings in the bios seems a bit low (see attached pictures).
Thanks for replies!

http://imageshack.us/photo/my-images/513/201207061252351.jpg/
http://imageshack.us/photo/my-images/546/201207061252431.jpg/
http://imageshack.us/photo/my-images/411/201207061252581.jpg/
http://imageshack.us/photo/my-images/444/201207061253191.jpg/
http://imageshack.us/photo/my-images/411/201207061258341.jpg/

Voltage readings inside hw monitor after bending the pin on the furthermost left side on picture 2:
http://imageshack.us/photo/my-images/651/serp.png/

 

[hunter315]

I would get both the PSU and the motherboard replaced. The melting of the connector indicates that there was a problem with either the connector on the board, the connector on the PSU, or both. It cooked a 3.3V pin, possibly the one with the sense wire from the looks of things, and according to BIOS your 3.3V rail is now running over 10% low which is way out of spec.

Im not sure what would have led to a catastrophic failure like that for that rail but something happened, and now that the connector on the motherboard has melted plastic on it it wont be making good connection which will cause issues.

 

[torsrex]

Thanks for the quick reply!
Do I still have warranty on the motherboard and the psu? Could the issue be caused by something I have done? Could this issue also have affected other parts of my computer (i.e the ram, cpu hdd etc)?
Thank you again

 

[HEXiT]

looks like your connector has been slowly baking. if there both in warranty then you need to replace both parts. its unlikely that your to blame for it as the plugs are made a very specific way it. it looks like a contact wasnt properly touching and causing an arch, this in turn over a long period cause heat and the baking of the cover. so no its unlikely to be anything you did.
as for affecting other parts. yes its possible you wont know for sure until your raplace the motherboard and psu, im sorry to say.

 

[torsrex]

Oh, okay.
Thanks.