Thans for reply. The BIOS recognize it us ST_M13FQBL. The disk spins for 10 sec, and it stops when clicking stops. In this link http://forum.hddguru.com/seagate-7200-need-help-with-diagnosis-and-fix-t18907-20.html#p143165 its about ST31000528AS. And 2 pins need too be shorted, for terminal to work. I tried that cos this pins are exactly like my PCB, but no luck. I will try again terminal with good hard disk, and use paper in head, and next in motor, to see if it works.....when i get home EDIT: I take good hard disk, i put paper on head contact - no clicking - no terminal. I put paper on motor - no clicking - no terminal This means that ROM needs to ID plates, and only that time terminal works.