retail installation of 10.6.3 works on my amd. .i use arch=i386 boot flag and it went all the way..i try to use hazard distro,it's a little bit complicated ..try retail installation.

Machine Specs:
AMD 780GM-A:ECS
AMD athlon 64 x2 6000+ Processor
A-Data 4GB 1066 MHZ DDR2
640GB WD-SATA2
Nvidia GeForce 8600GT 512Mhz
internet working - Attansic L1
Audio - Via USB Audio Dongle