Unexpected trouble with starting database

[chloecole]

I'm novice database administrator in my new working place. I don't have any experience with sql databases. But I hope someone of local users had similar issues The header for the file 'Jio3.mdf' is not a valid database file header. And I hope you know how to handle this.

[edwanders]

Start SQL Server Management Studio or via third-party software, but only in case a guide below didn't assist you, good luck!

https://www.sqlserverrepairtoolbox.com/

Click the “Start” button. Move the mouse cursor to the “All Programs” menu, then find and click “Microsoft SQL Server” to open a list of SQL Server programs.
Click “SQL Server Management Studio” to open the Connect to Server dialog box.
Select a server on your network. Set the “Authentication” pull-down list to “Windows Authentication” and click the “Connect” button.