Firebird 3
If Firebird stopped (and EMDI is displaying a message that says it was terminated because one of the following database-related problems arose), we can go to Task Manager by right-clicking on Start (or pushing simultaneously [ctrl+shift+esc], or [win+R] and typing “services”) and after locating FirebirdServerDefaultΙnstance (Services tab), we right-click on it and select “Start”.
If that doesn’t work, we can open cmd and type: net start “firebird guardian – defaultinstance”
Firebird 2.5
In case of firebird 2.5, we can go from Windows control panel and start it.