Hi.
Based on the information you have provided, it seems that the issue might be due to the Hard Drive.
As you have mentioned that the Notebook was dropped, this might have caused a Physical damage to the Hard Drive.
Hence, the Computer might not be detecting the Hard Drive.
As the issue might be Hardware related, it would be better to get the Unit examined at the Sony Authorized Service Center.
Before sending the Unit to the Service Center, you may try resetting the BIOS to its default values.
Performing the BIOS reset should resolve the issue.
If the issue still persists even after performing the BIOS reset, then you may get the examined at the Sony Service Center.
You may initiate the Service by filling the required details in the below link:
https://eservice.sony.com/webrma/web/index.do
Hope this helps.
Please feel free to contact for further information and assistance.
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