To avoid having to follow the above steps every time, your Mac can be configured to connect automatically at start-up. Click on Apple (in top left of Finder window)/System Preferences/Accounts. Click the lock and type in your username and password. Click on Login Items. First, see if any Volumes from the old server are in the Login Items list. If they are, delete them by clicking and hitting the "-" button. Then, drag the Volumes you wish to automount from the desktop to the "Login Items" list. If you don't want the icon to appear on your desktop, click the "Hide" checkbox. It will still be mounted.