I built 2 systems almost identical and one of them tries to boot to the wrong HDD. It will just sit there with "Loading operating system . . . I then hit reset and go into the boot setup (F12) and tell it which one to boot to. It will boot to the correct HDD then, but next time I turn the computer on it will do the same thing. What setting do I have wrong? Do I need to switch the SATA cables around or something? Any help would be appreciated.