There was a powercut and pc cannot boot after power restored. I cannot boot anymore from this HDD so i tried to get data from it using a USB docking station but on disk management disk was displayed ad Unknown Not Initialized with no capacity. How can i manually fix this?

First of all I recommend you to try to clone that drive with DD. There might be a bad sector issue, which could be already fixed within the clone process (if needed in forward + backwards).

As drive does not show capacity one will not be able to clone this drive with dd. Looks like drive has some severe problems. If data is important I would suggest to contact a pro to get proper diagnosis. If not that important you might try to connect the drive directly by SATA and see if drive is detected this way with right capacity. Better to use linux and ddrescue or hddsuperclone to get an image and then let some data recovery software check the image for your files.

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And does the HDD spin? Does it makes noises?
A powercut could damage PCB or even worse, damage head amplifier.

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