HDD stopped spinning while running. Is it completely dead yet?

Sep 1, 2018
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My drive is a WD10EZEX-08WN40 (Blue 1TB)

PC was running normally then suddenly everything froze and it tried to reboot. "No Operative System found". I looked into the BIOS and the HDD was not detected. My second HDD is still there though. I opened the PC case and swap both cables between the two drives. I tried to boot again and the 2nd drive was detected but the 1st didn't even spin at all. So the cables still work and it wasn't some power surge from the PSU as the second drive still works.

I took the PCB and look for burnt parts: there was none and no smell. I replaced the PCB with a NON exact match donor (WD Blue 500gb). I connected just the power cable to the drive and it spun! I turned the PC off after ~15 secs. I then put my original PCB into the 500GB drive and it didn’t spin (so my PCB was indeed dead). Now here’s where I fucked up big time: without even swapping the chips between boards I connected the SATA data cable to my 1TB drive with the donor’s PCB. It did not spin this time. I returned the PCB to its original drive. It didn't spin either. I've killed it. Here are some photos: https://imgur.com/a/4nQnV99

I got my hands on a match for my drive. I tried yet again to swap PCBs, but no data cable this time. It spun flawlessly! For 20 seconds. Then it stopped and the PCB died too. I haven't done anything else since then.

Another thing to note is that my second drive was laying on top of the first like this: https://imgur.com/a/wm8zTKA I didn't have enough screws and was fool enough to get used to it just working.

I can't afford Data Recovery services. The data that was in there was not critical, but I really would have liked not to lose years worth of photos and notes. If you could help me figure at least WHAT happened in the first place I’d be so grateful.
 
Solution
mrrenho, not as easy as it sounds. I would keep the drive in storage and hopefully one day you may be able to take it to a recovery service. The best way to prevent this is having a solid back up plan.

Basically you want:

3 copies of any data you don't want to lose
2 different mediums it's stored on (so 2 different drives in your computer, for example)
1 copy kept offsite, to prevent against disaster.
mrrenho, not as easy as it sounds. I would keep the drive in storage and hopefully one day you may be able to take it to a recovery service. The best way to prevent this is having a solid back up plan.

Basically you want:

3 copies of any data you don't want to lose
2 different mediums it's stored on (so 2 different drives in your computer, for example)
1 copy kept offsite, to prevent against disaster.
 
Solution

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