Thank you for all the answers!

I got stuk with the screen said:

Reboot and select proper boot device or insert boot media in selected boot device and press a key.

I think the computer can't boot from HD(can't find it), even I put both of them back, still not working.

Any idea?
connection is ok,jumper is correct, one HD(old)set as master, need to re partition? And how? Any information will be very appreciat.