Well assuming you did things correct, tough luck.
Why you would want to put an old HDD in a NEW computer is a bit odd though.
Depending on how old we're talking, it's a disadvantage to do so.
HDDs for example, may run at 5300RPM or something like 7300RPM or so.
Well the higher the better. Thus if you had an old, thus slower HDD and put it in
a new computer, it's hardly that effective. HDDs are pretty cheap, why not just buy a new one.