I recently helped a couple combine two of their desktops into one desktop. The process went fine, everything booted. However, I put the Hard drives in and it will boot off HDD A and will not have the option of booting from HDD B. Furthermore, when I try to access HDD B's information (it does detect it in my computer) it says access denied. So two questions, how do I get past what's blocking me from transferring information and how do I get both hard drive's to boot?