I have a new Gigabyte GA-78LMT MB with a AMD FX-6300 CPU. I've changed the power supply, ram, hard drive, and vid card testing it. What happens is it will not post, no beeps no bios display. I don't have another AMD CPU to test. I could send it back but the deal I got on the system was to good and will be still a good deal even having to replace one or the other. So how can I determine what part is bad.