Hello Gigabyte,
I recently had a problem with my motherboard (GA-Z68X-UD3H-B3) after installing a new video card (NVIDIA 560 Ti). The motherboard would not POST and removal of the video card and all other unnecessary hardware didn't alleviate this new problem. Scouring the internet results in hundreds of posts where people report the same no-POST problem resulting from various catalysts. I had never overclocked, removed the processor, or abused this computer (I say this to show I don't feel I caused the problem) and was now set back by having no home machine. Following the directions of your website, I then waited for Monday (unfortunately had this problem on a Friday night) and called the support phone number rather than immediately request an RMA. This support technician who answered the phone was incompetent in any technical manner and was unable to provide an troubleshooting or helpful advice. I realize this is an issue that he may have no way to provide support for, but his only go-to support line seemed to be "submit an RMA".