Asus M2N-X - Manual (Page 76)

2- Chapter 2: BIOS setup
2.6 Boot menu
The Boot menu items allow you to change the system boot options. Select
an item then press to display the sub-menu.
Boot Settings
Boot Device Priority
Boot Settings Configuration
Security
2.6.1 Boot Device Priority
Boot Device Priority
1st Boot Device [1st FLOPPY DRIVE]
2nd Boot Device [Hard Drive]
3rd Boot Device [ATAPI CD-ROM]
1st ~ xxth Boot Device [1st Floppy Drive]
These items specify the boot device priority sequence from the available
devices. The number of device items that appears on the screen depends
on the number of devices installed in the system.
Configuration options: [xxxxx Drive] [Disabled]