I replaced a WD5000AAKS hard drive with WD5000AAKX and then tried to install Win 7. I get all the way thru the disks and it says installation is complete and the system needs to reboot. It reboots on its own but then I get a black screen with a cursor. No error messages nothing but a black screen with a cursor. And it will sit there forever. Could this be the hard drive is no good or the recovery disks are not working? Or is there a software that I need to install on the hard drive before I install the os?