I have a problem with booting the retail disk from by DVD drive. I have played around with the boot settings and boot sequence in my bios but it just wont load the Retail copy of Mac OSX 10.5.5.

My specs are as following:

CPU- AMD athlon 64 X2 6000+ Socket AM2 (940)
Motherboard- GA-MA770-DS3
Ram- Slot #1 DDR2 2048mb ,Slot #2 DDR2 2048mb
Graphics Card- Galaxy 9500gt (nvidia chipset)
HDD- 500gb sata 7200rpm

I would like help just to know how to boot the disk up as i know to do the rest thanks in advance