I will appreciate if someone can create Multicast training video. This is more demanding than uni-cast. Thank you.

Hi guys,
I am having problem pushing multicast images to clients. When I start multicast deployment, boot clients from PXE, but will all hang at blue screen “Please Wait”. I checked my log viewer, and found error like “Failed to connect to database server, will try again in the next iteration. “
I have done all like changing Mysql password in /opt/fog/service/etc/config.php and /var/www/fog/……
I have done connect_timeout= 5000 but way out yet. I have used Ubuntu 8.04, 10.04 with FOG 0.27 and 0.32.
I could not find FOG database created in MySQL when I checked yet it prompts me for MySQL root user password twice during installation.
Can somebody help with suggestion?