... Such as
What motherboard or prebuilt system, and OS, are you using
What <same info> was the drive used on
Is the drive detected in BIOS? In Device Manager? In Disk Manager?
How long ago was the drive last known to work?
Since then, have you dropped the drive, had a failure of the system in which the drive was running, or immersed it in ice cream?
Does it make loud noises? Any sound at all?
We will try to distinguish between a need to change cables, adjust the BIOS, or run recovery software.