I´ve changed an hdd head for another form an equal hdd, i´ve followed all the procedures, but when i turn on the hdd, the head start knock an then it turns off, what can i do?

You should turn back time and read this..

diy-what-the-big-deal-t12671.html

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Data Recovery Ireland

Which ones are those?

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www.datarecoveryne.com

1) Watch Scott Moulton videos on YouTube, taking notes
2) Wash hands and close windows
3) Remove cup of coffee from table
4) Peel Back Label and throw it in the trash
5) Remove screws with the wrong screwdriver, drop 3 on the floor
6) Take a bite of your cake and drop a few crumbs on the platter
7) Don't worry, brush the crumbs off with your finger and blow the rest of them off with a big puff
8) Pull magnet off.....ooops, clipped it off the platter. Hey, that's a strong magnet!
9) Unscrew Head Assembly without pulling away from the platter. Don't worry, it's not going to scratch it....probably.
10) Repeat with donor
11) Put heads into the patient. Ramp them on with a big flat-head driver. Ensure the heads bend out of shape, they'll be ok.
12) Put top cover back on, don't worry about the fingerprints
13) Plug drive into PC
14) Why isn't it working??
15) Join HDDGURU and seek assistance.

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Data Recovery Ireland

He should have purchased that hardback. Seriously though your in trouble now

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All went well until I plugged the drive in.

On first proper diagnostic´s , if hdd reach readiness, on start or knocks, wich brand i.e if its wd 2.5 laptop and u change pcb surely start to knocks, by difference of " head map " , doing wrong diagnostic u get knocks, and u suppose bad heads, and u replace heads, and problem was only PCB ; Ok thats an example

2. Example Seagate 1 TB , 7200.11 incorrecto power supply, causing shorcut to Important components SMD , tech, exchange PCB, but cannot start over this familie start to knocks, and think ! Heads! , So replace heads, using donnor, after that hdd its knocking, so think , need to change platters to another disk, and what u get a completely missalignment case , when was only need a donnor PCB , and reprogram it to links " Firmware PCb " with " Engineerig Tracks, Platters"

I hope this help u

Regards

HAHAHA...this is probably the funniest thing I've ever read on here.