Please do try these troubleshooting steps that may help in resolving that issue.
- Start by doing a hard reset, remove the battery and AC adapter then press and hold the power button for 20 seconds then see if it will boot up normally.
- If you're still getting the same error it has something to do with a loose connection. Reseat the connection of your HDD, take if off then put it back in making sure that it's seated properly.
- If you'll get the same error go to BIOS and check weather if your HDD is being detected because chances are the HDD had been damaged when it dropped or the motherboard has been damaged also.