SQL Server 2005 I get "The database is not accessible"

I have a computer working as a server with many SQL Server 2005 databases in it since two years ago.

Today, I don't know why, when I try to connect locally to any of the databases it gives me that error. It fails even if I'm logged in using开发者_Python百科 Windows Authentication or as 'sa' user. It just wouldn't let me access the databases' info.

Could anybody explain me what's going on?

Database does not exist or it's offline etc.

First check, can you see the DB in the object explorer in SSMS?

Well, I don't know what was going on. I ended up rebooting the server and it all started working fine as always.