There may come a time when you need to boot from a floppy for troubleshooting purposes or boot from a CD to install a new operating system.
To do this you can change the boot order in your computer’s BIOS (basic input/output system). The BIOS is built in software that determines what the computer is setup to do without using information from the hard drive or operating system.
To get to your BIOS settings, start your computer and look for what it says you need to do to enter setup. You may have to press the delete or F2 key. Not all systems are the same.
Once you get into the BIOS there will most likely be a section named Boot. From there you can change which drive the system looks at first to boot from.