Hi banjaluka! I am also in trouble with DETSEC error, my disk doesn't spin up after U command. Could you help me where to screw the PCB? I don't know where it was supposed to be connected to head contacts. mrlondon, I don't know if you have already solved it, but in my case the reason was that I had the card that isolated PCB from the head contacts was mounted for a day or a two (until I've fixed the problem with the cable), and removing the card didn't really provide contact between the two. So what I had to do additionally, was to carefully screw the PCB where it was supposed to be connected to head contacts. It solved the problem - spinning up and the rest of the instructions worked like a charm! Now, I am backing up my data, and as soon as that is finished, I am going back with this hard disk to the shop where I bought it! Thank you all kind people!