just installed a new hard drive on my mac book pro and when I try to install the operating system it just won't recognize. I followed the instruction that I received from the apple store and online. (I did have the apple store guy do a diagnostic and they verified that the hard drive was bad and needed replaced). I insert the operating system disk, turn on the computer while holding down the "C" key. The apple logo will show on the screen with the spinning wheel but then nothing. It will spin for a while then the screen just goes blank. Can anyone help me with this issue?