How to install MySQL 5 and remove default install

Hi all,
I have some problems to make MySQL 5 works fine on Mac OS X server.
I have installed the package (http://dev.mysql.com/downloads/mysql/5.0.html) but a instance of the old mysql still running.
Can someone explain me how to remove the default install and make the new one works?
PowerBook G4 Mac OS X (10.4.3) Mac OS X Server

"pwd in directory /usr/local/mysql return /usr/local/mysql"
I didn't really address this in my previous post, but this could be a problem. This seems to indicate that there is an actual directory named mysql in /usr/local. That shouldn't be the case. If it's empty, you should remove it and replace it with a symbolic link to /usr/local/mysql-standard-5.0.16-osx10.3-powerpc (assuming that's the version you have installed).
To create this link, cd to /usr/local and enter:
ln -s /usr/local/mysql-standard-5.0.16-osx10.3-powerpc mysql
Or you may want to run the installer again. I would hope that the installer would not fail without giving you an error, and since creating this link is not necessary for the installation, it probably just ignored it, but the presence of the directory would have prevented it from creating the link, so it could have interfered with the normal operation of the installer.
Normally when you install MySQL it installs into the /usr/local directory, creating a folder with the full name of the version, e.g. "mysql-standard-5.0.16-osx10.3-powerpc" in the case of the current version. It then creates a symbolic link to that directory called "mysql" in the /usr/local directory. That's why, normally, if you cd to /usr/local/mysql and issue pwd it should give you the full path to the current MySQL installation directory.
The beauty of this system is that it leaves your current installation intact, so if you need to back out, because some of your applications are not compatible with the new version, you only need to re-point that symbolic link to point back to the old version.
It also allows you to transfer your data very easily. Even if you forget to extract the data folder from the old version before you installed the new one, your data is still there, safe and sound. (That's why I've been recommending leaving that folder alone until you sort out the problems with the installation of the new version.)

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