Check Device Manager first to see if it appears there. If not, the drive is probably too damaged to function at all. Hopefully, you had any data backed up.
But if it does appear there, try Disk Management (Run: diskmgmt.msc, or Admin Tools in Control Panel) to see what state it says the drive is in.
Usually a drop does its damage immediately, but you may have an exception. They are delicate.
DO NOT USE CHKDSK as you were advised if there is data to be recovered. Chkdsk is a great tool, but if the drive is damaged and chkdsk gets incorrect data from the partition table, it can scramble files so that CSI couldn't get them back even on TV. Attempt file recovery first.
(FYI: Chkdsk cannot be used on a drive that does not appear normal in Disk Management and is formatted. Chkdsk only repairs the file system and nothing else.)
The hard drive in your computer is in one of two states right now. It's
either going to fail or it already failed. Hard drives are inherently
fragile things with no built in redundancy.