More likely the mobo than CPU. Are you running Intel HD from the CPU or discrete card?
I have two hard drives, a SSD intel and 2 GB drive for data. Both using SATA conectors on mother board. I use the graphics in the I5-650 CPU. My thinking is the CPU or motherboard could be bad. I am going to get both and start by replacing the CPU. If that fails I replace the mother board with old CPU. Wost case I replace both.