Custom Services no longer working

A Drupal 6 project using Services & AMFPHP I have been working on was recently moved to a different server.

The built in services are working fine:
(services/browse/system.connect, views.get etc.)

I've also tested the example echo service and it is working.

However, all other custom services are no longer working.

When I attempt to call the method using the service browser I get the following message:

"Access denied for user 'apache'@'localhost' (using password: NO)"

When I add the user apache@localhost and grant the SELECT INSERT UPDATE and DELETE privileges, and then call the method, I get the following message:

"No database selected"

I'm trying to put together some suggestions for the IT guys.

Any ideas would be greatly appreciated!