Does Windows Disk Manager see it?

(Start/Run COMPMGMT.MSC, Storage, Disk Management)

Does windows Device Manager see it?

(Start/Run DEVMGMT.MSC, Disk Drives)

If neither see it, then I believe this indicates a hardware problem with the disk, the cable, or the SATA socket/controller.

There can also be some BIOS settings that might make the disk disappear, and certain kinds of hardware issues can cause the BIOS to change settings too.