I just recently installed a new z77 gigabyte mother board, an i5 3570k and a 7970 into my computer. For some reason when i turn it on and go to the bios (keep in mind im using an old hard drive that still has windows 7 on it that i have yet to reformat) the screen turns on, my card is powered up, im in the bios but i look at my cpu fan. it spins like once every 5 seconds almost like its struggling to spin. This is the stock intel fan that came with the cpu. Im worried now why its not spinning. I turned it off after a few seconds because i didnt want anything to happen to the cpu. Does anyone know whats wrong?