Hello friends, and hddgurus´s Happy New year, and GOD bless u

Now after some days of holiday, return no works ,

This is my case Samsung SP2004C Sata , on first the hdd doesnt spin up, tried to repair the PCB but still doesnt spin up , so i get a similar Donnor HDD, exchange pcb, this PCB doesnt have external ROM, serial or parallel, so would be inside microcontroller, so i get the donnor pcb and hdd spin , but did a little knock after tried to recalibrate, opened the HDD and was found a little head crash over the land zone, so i tried to replace the MHA from donnor , on first move the heads out from the land zone, but did a sound like " shhh" while the hdd was spinning, so turn of inmediatly and check, not damaged so i move heads to the land zone and did the same sound, my question its this sound its caused by the crash over the land zone, next im going to upload the photo

Thanks, sinceraly

Alberto