Starting a 2nd MySQL instance on UNIX

I have a Solaris box where MySQL 4.0.20 instance is running (to support Bugzilla 2.22). I have loaded mysql5.0 on the same box (for Bugzilla 3.0.3) and created a new mysql50 user that I want to use to run this instance with. I tried to start the instance on another port by running the following command...

./bin/mysqld_safe --defaults-file=/usr/local/mysql-5.0/my.cnf --socket=/tmp/mysql50/mysql.sock --port=3307 --basedir=/usr/local/mysql-5.0 --datadir=/usr/local/mysql-5.0/data --pid-file=/usr/local/mysql-5.0/mysql50.pid --user=mysql50

The instance appears to start but the message "Starting the instance" comes up and I never get back to the system prompt. it just sits there. If I open another terminal window and do a ps -ef | grep mysql, I can see the new processes running. There is nothing in the error log.

I ran the mysql_install_db.sh script to create the mysql database however, I cannot log in. I thought that it creates a root user with no password. I tired logging in as root with no password bu no luck. If i use the mysql 4.0.20 root user password, I get into the 4.0.20 instance even though the mysql50 user does not have mysql 4.0.20 in it's path. when I run mysql at the prompt, how would I differentiate between the 2 instances?

So at this point I am stuck. If anyone out can help guide me on what I need to do to ge tthe instance up and running properly, I would appreciate it. I am rather new to MySQL and I have read through the docs but things are still not very clear.


Thanks!

Mark