Ok, sorry about not enough info I just got the harddrive and already had this computer, the original hard drive that's been confirmed working has been tested, plugged in properly, and doesn't work anymore.(both cables)
Neither boot successfully, the one I had before has backtrack on it, and doesn't even get to the login part of booting, and the new one asks me if I want to boot into windows safe mode or start normally, ie tried both options and it powers off just then