I am building a computer and i have run into some issues. I have an AMD FX 8150 cpu, a Radeon 6870 graphuics card, and a gigabyte p70a ud3 motherboard. I did a test boot with just those components and it worked fairly well. Then I put it into the case and added the hdd, cd drive, etc. Now it will not boot at all, including when I take all of the extra pieces out. How can I diagnose which part is causing trouble and how can I fix it. (In addition, i came across a part called the 1394 port. Is it optional or required? If so, which cables do i connect to it. I couldnt seem to find any that fit. I do not know the fuction of this piece.)