You will have to check the settings of your database installation. If you are using MySQL, check to see that MySQL support has been enabled in PHP by using phpinfo()
. On most Linux distributions you need to install an additional php-mysql or php4-mysql package to install MySQL client support in PHP. More likely, the username and password you have provided on the installation page do not match those used when setting up your database. In particular, make sure you choose the right Database Driver and enter the correct values for Host, Username, Password, and Database Name.
Also, have a look at the first half of this discussion: viewtopic.php?t=1153
If you could provide more information about your platform (PHP version, database type and version, operating system, webserver type and version) that would be most helpful.
OJS Development Team