Specified SQL Server Not Found: (ASP.NET(1.1) - SQL2000)

Hi,
I was hoping someone may be able to shed some light on a SQL2000 connection problem.
I have an ASP.NET(1.1) application that connects to a SQL2000 instance on the localmachine, the connection details are as follows:
 Connection Code :try
{//connect to the provided datasource
using(SqlConnection connection = new SqlConnection(strConnectionInfo))
{
strStatus = "Pulling Data";

SqlDataAdapter sqlA = new SqlDataAdapter("SELECT * FROM NavBlocks",connection);
sqlA.Fill(dsNav.NavBlocks);

SqlDataAdapter sqlB = new SqlDataAdapter("SELECT * FROM NavItems",connection);
sqlB.Fill(dsNav.NavItems);

bNavLoaded = true;//prevent further calls
}
}The connection string is as follows: "Data Source=BOBBITSQL2000;Initial Catalog=pinnacleCMS;User Id=myUser;Password=myPass;"
Now this conection has never been a problem, the intial catalog exists, the user exists and has permissions, further to this this users connection details can be used to succesfully access the database from a dsn on this machine. The server explorer finds the database fine, Visio finds the databse fine.
The problem only existed after I reverse engineered the database into visio (the database was originally developed using Visio), then dropped all of the tables using Enterprise Manager, and re generated the database from within Visio (ddl script)  following a few minor changes.
Since the re generation I get the server not found error message from the ASP.Net application.
I have tried using different network libraries, logging in using the sa account etc, it makes no difference the ASP.Net application cannot see the SQL server instance.
Any ideas would be greatly appreciated.
p.s. I have tried dropping the firewall with no success, no updates have been installed.Thanks