Possible HDD Failure

A week or so ago, my PC suddenly powered off while gaming. I removed the PSU and tested it via the paperclip method, which showed it to be dead. I purchased a new PSU (750W Antec Edge Silence) and everything powered up OK but all 3 of my internal HDDs (non-SSD) are no longer recognized in Windows. They do not appear in File Explorer, Device Manager or Disk Mgmt. 1 of the 3 does appear in BIOS, but I'm unable to access it Windows. I have added a brand new HDD, and it works fine, so I don't think its an issue with the new PSU or SATA Cables (Just to be safe, I have tried diff. SATA cables but to no avail).

I also tried all 3 drives in an external HDD dock. All 3 will appear in Device Manager as "Generic HDD USB Device" but there's no info/data etc. They'll also appear in Disk Mgmt & Explorer, when connected via the dock, but again as a "Removable device" with "No Media". I still cannot see any data/info associated with the drive via any method.

All 3 drives worked fine prior to this issue and no other components appear to be malfunctioning. My 2 SSDs and BD-ROM Drive, which were all installed prior to the PSU failure, were not affected and continue to operate normally. The 3 drives are:

WD1001FALS (WD 1TB Caviar Black SATA)
WD30EZRX (WD 3TB Green SATA)
Seagate Barracuda LP 1.5TB


I assume that the HDD failure is related to the PSU failure, and my options of any sort of recovery are likely few/expensive. Any info or advice on potential steps I could take would be greatly appreciated. Thanks very much.