Local install of existing site won't connect to mysql

Hi,

I’m trying to prepare to move a hosted WP site to another host that someone else had built a few years ago and wanted to practice the move to my local Mac to make sure I can get it moved. I’ve gone through installing and setting up MAMP and WordPress and had already copied down the theme files that were created and the DB. I got the default WP site up initially with no problem and was able to change the theme as well but when I go and try changing the DB it uses I get an error of “Error establishing a database connection”. I went in and updated the wp-config.php with the local DB name, user name, and password but for some reason it can’t connect, I even changed the PW in the DB for the user but still no luck. I have a feeling I am missing something easy but have been unable to track it down thus far through the forum or general google searches. Anyone have any ideas or pointers of what I’m not updating? Thanks in advance for any help.

Thanks
Matt