Database Connect Error...??

[eluser]dhall[/eluser]
I have been working on a project for some time now that CRUD's data within my database.
Just today I get this error.

------------------------------
A Database Error Occurred

Unable to select the specified database: leansigma

Filename: C:\xampp\htdocs\lean6sigma\system\database\DB_driver.php

Line Number: 140
------------------------------

I have not changed anything within or around my database connection.
I have checked and rechecked my db config file and it all looks correct.

I have even tried several old projects and those don't work either.
Any ideas what is going on?