Newer MB, may not have to go into Bios to change Boot order. Most newer MBs allow for Hitting a "Hot" key during post that brings up a boot menu.
My Gigabyte MB it is F12, and On my Asrock MB it is F11.
Note: this does NOT affect what is set by BIOS Boot priority. Works great for Installing windows over a HDD that has an OS already on it, as you can select the DVD drive to boot from, then when the system re-boots it will automaticly select the HDD - UNLESS you again hit the F12 or F11 during Post.
Think Asus might also be F11 and for other Brands, just check the manual.