I made a boot USB but in one stage it says no cd found on druve 1, on other stage after chameleon is loaded there is no DVD icon only HD

I am with Gigabyte EP43-DS3, curently use 10.5.8 retail with Boot 132,
I have DVD retail 10.6 but I can't make from BIOS to see DVD drive in Chameleon boot screen.

Can any one give me advise how to set up the BIOS so I can use DVD drive