Many questions come to mind. Why did you take your 160 out of it's original config?
Yes, I know you had boot issues but why did you remove the hard drive?
It could be a simple problem. Today's hard drives are very durable and I doubt it was your drives fault.
This is what I want you to do. Remove Power!
Re-install your 160 hard drive just as you had it before. Then re-seat all of your cards and memory.
Be careful and gentle. I get so frustrated with my computers that I tend to kick them but find out later it has nothing to do with my computer (in this case it was a KVM switch).
Let us know,
Your Hardware Guide.