If i were you I would take a step back and put the hard drive back in…see if it works…then ask yourself why? Why won't it work without the other hard drive….which hard drive has the operating system on it…maybe you could swap the cables around…could it be that windows seven is installed on the hard drive you took out? If it isn't I still suggest putting things back to when it was working and then start from there. let me know if any of this helps... I will work throughit with you..