Most bios's use F1 or 'delete' key to enter setup. Yours may show/have on screen something like 'to enter setup press 'del' or something right after start up. You may want to turn on monitor and get it warmed up prior to the system gettting going on some of these faster machines before you power on the monitor if it not one of the lcd types as it may get past this point too soon for the display to show it.

Also, if you cannot get into setup before it is passed by, then as soon as you start reboot, tap and keep tapping rapidly the F1 or delete key till it 'beeps' back at you (as fast as you can move that finger). That should get you to setup.
I have run across a bios that also used F5, but only once.

Tiptoe around in the settings...especially if you have NO idea what one does, at least there is a 'return to default' somewhere that should get you out of trouble IF you changed something that you shouldn't have touched and nothing works..hopefully.

What you want to change is the order that the bios looks for the boot device. Normally they look for hd, called 'C' by the bios first.

The 'string' of options look like this: c, a, cdrom or similiar in most bioses, use the indicated keyboard arrows to change the option to: cdrom, x, x, so that cdrom is the first boot device.

Other bios's have a 4 teir list, just make sure cdrom is listed in the number one position. or at least ahead of the hard drive.

Be sure to 'save' before exiting or all changes will be lost and you will be at the same place as you started from.

If this sounds too 'spoon feeding', I didn't mean to offend, But you said something that made me feel you are a true novice...especially around the bios. btw, I get 110 percent awake whenever I am in the bios also. Just fyi.

That is so I don't go