Yup, yet another cheap and nasty component off a gigabyte board as killed my rig. It's a 5V mofet at best guess, everything turns on but no life and the CPU fan doesnt move (yet its fine).
Just steer clear of gigabyte, there cheap!
My five rigs have been running $84 gigabyte boards for several months no with no problems. My desktops have all been gigabyte boards for the past 5+ years, and I have had exactly one bad board, (recently), with a DOA lan port which I had refunded from new egg. Other then that, I moved to them because I was sick of other motherboards dying randomly and/or taking parts with them.