My old PC recently died, so invested in a new W7 laptop,
Had 3 SATA HDD's in it, all are recognised by W7 on laptop, mounted in a Sharkoon SATA Quickport Pro LAN, 2 of the HDD's removed from my PC are recognised by W7, but one, a Samsung HD401J with all my Video stuff on, is not,
Powers up in dock, you can hear it spin, then HDD starts working (you can hear it) for a short while, bout 5 seconds, then it stops, but still spinning afterwards,
Also tried it in a external HDD caddy, same result,
Nothing shows up in Disk Management or Explorer,
Any ideas pls ?

Check it out with MHDD. Suggest to read manual first.

http://hddguru.com/software/

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Thanks, I'll try that and get back with results.