Hi,
I had a similar issue on Centos - blank screen after clicking the install button.
php and mysql were apparently installed, but it seems I also needed to install the php-mysql package.
(from http://osticket.com/forums/showthread.php?t=1190&page=3(http://osticket.com/forums/showthread.php?t=1190&page=3))
- yum installed this and its dependencies
- restarted httpd and mysqld services
After that I resubmitted the install page and got a "basic install succeeded" updated web page pretty quickly in response.
Might be worth checking...?