I just bough a new HDD some time ago and recently i bought another SATA cable to have both HDDs connected at the same time, to transfer all the files from the older one to the newer. When i connected both of them, the computer started working, i tapped F2 to go to bios to make sure it was detected, and then after 5-10 seconds the computer instantly shut down. After this incident, my computer won't start at all when connecting the SATA power supply to the old HDD. If i connect only my new drive, it works without any problem. If i connect only my old drive, or both the old drive and the new one, and then push on the power button, the cpu fan simply rotates about 5 degrees and then stops.. and that's it, the computer doesn't start, and no sound from the pc speaker either. Is there any way to recover my files from the old HDD and transfer them to my new one? I do not want to use the old HDD any more, i only need to save all my files.

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Sounds like a HDD power issue/short, check your groundings and that the old HDD's not being shorted by something. Ideally mount it into the case chassis. If you still can't get anything from it then buy an external USB caddy/adaptor to test it with - but no promises that'll work if the drive is damaged/now faulty. – HaydnWVN Feb 8 at 10:44
Did you make any changes or ever disconnect the power cable from the old drive before it started failing? – David Schwartz Feb 8 at 10:47
I haven't used the old drive for about 2-3 months, and it was disconnected entirely from the computer (both data and power supply cable), but the disk was inside the case chasis, and everytime i (dis)connected any hdd (with the sata/power supply cable), i turned off the power supply from the back of the computer (it has a button labeled 0/1). – vlad Feb 8 at 11:00
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