by Ken Task.
Does the DB exist for this new install?
mysql -u root -p
should get you a mysql prompt. Go ahead and login if you get a prompt.
While at the mysql> prompt, show databases;
See a DB for Moodle 2?
\q to quit mysql.
So no references in apache logs ... error or access?
In the moodle 2.4 code directory, create a index.html file with 'hello world' in it to see if you can see that.
Is your 1.9 site in a moodle directory on same server?
Check permissions ownerships on that directory and compare with the permissions owernerships on the moodle 24 installation.
Might have to ask for a quick review on how you are step. PHP version, MySQL version, Apache version.
'spirit of sharing', Ken