Unable to boot to disc

So I was having problems getting to the boot menu of my Lenovo G580 laptop earlier (http://www.eightforums.com/general-support/20122-lenovo-wont-boot-disc-no-option-splash-screen.html). I figured out how to get the boot menu - But my only options are hard drive, LAN v4 and LAN v6 boot - Nothing about a disc. So I went into the BIOS boot priority menu and set disk to #1 - It still booted to my...