Prohibition sign on apple logo

[Muna21]

Hi guys, i'm trying to install Snow Leopard, following the guide i found in this forum, and everything seems going well. I'm able to boot the SL Dvd, but when i get to the screen with the apple logo and a circle turning on the bottom, after 1 min i see a prohibition sign on the apple logo, and nothnig more, it just keep there.
How can i fix it? As suggested from the guide, i tried to write -x -v -f, but nothing

Spoiler: My hardware

Motherboard: ASUSTek CM6870
CPU: i7 3770 3.40GHz
Ram: 16 GB DDR3
GPU: NVIDIA GeForce GTX 650 1gb (Asustek Computer Ink)
Storage: SSD 850 Samsung Evo 250GB (i put this ssd instead of the original HDD )
Audio: Realtek High Definition Audio
NVIDIA High Definition Audio
NVIDIA Virtual Audio Device (Wave Exstensible) (WDM)
Network: Realtek PCIe GBE Family Controller

 

[Going Bald]

Doublecheck BIOS settings for SATA Mode = AHCI. This is the most common cause.
Boot with -v and post pic of last screen where boot stops.