Hi there coworld,
It may be a good idea to connect to another computer as a secondary one. After that you should see whether it has healthy partitions and/or file system in Disk Management. Depending on that, you may have to use either a data recovery software or some partition recovery software first. Also, keep in mind to save any recovered data on another location in order not to overwrite the HDD.
Hope this will help,
D_Know_WD