I just recently RMAed my x58 for BSODs. I installed the replacement and it ran very well, in fact this is the best my computer has ran a long while. 
 
I poked around on the internet this morning before work and then headed out. I returned from work and everything was off (keyboard, mouse...etc.) but my case light was still on. I turned it off and tried to reboot and it would just hang with no power to the USBs. So I shut it down again, turned off the PSU and removed the cord. I let it sit like this for about 45 seconds then plugged it back in and turned on the PSU. I hit cleared CMOS and then tried to power back up. Now it powers on for maybe 1 - 2 seconds and then off in a continuous loop. I waited to see if it was the standard 3 loop that you'll see on gigabyte but no go, it keeps looping. The errors that I was getting was 02, EA, 01, 68. I'll update if the errors change. Has anyone else seen this happen? Is it possible that this board failed already or am I missing something?
 
Thanks!
House

OK unseat every single cable everywhere attached to or from the motherboard. Then reseat every cable. 

If the problem still occurs try one stick of ram and swap out that one for another if it continues. Do you have another PSU to try?

In case one stick is bad you need o try more than one of course.
 
Definitely try another PSU if possible.

Thanks for updating the resolution for your issue.  If you have questions or need help overclocking, don't hesitate to post over in the Z87 section, or, for OC'ing, the Overclocking, Cooling, Benchmarking section.