OK, the BIOS hardware detection only confirmed that the hard disk is not detected. Unfortunately, this usually means it is a hardware failure with the hard disk and it needs to be replaced; however, in some cases, you only need to disconnect the hard disk and reconnect it back.
To get to the hard disk, you need to unscrew several screws on the bottom and remove the bottom cover. You will then see the hard disk and other computer components. If you are comfortable doing that, you can give it a try and see if reconnecting the hard disk will help.
You can watch this video to see how to get to the hard disk:
However, if you are not comfortable doing that, then you can take the laptop to a computer repair shop. If the laptop is still under warranty, you can contact the Lenovo support or a Lenovo authorized service centre and report the problem. They will replace the hard disk for you, but the data stored on the current hard disk is, unfortunately, lost. I am sorry to report the bad news.
If you have further questions, let me know.