This article is from the the Brief Linux FAQ (BLFAQ) Maintained by Neil Zanella nzanella@ganymede.cs.mun.ca
You might have to tell your BIOS (Basic I/O System) to enable booting from CD-ROM by changing the default BIOS settings. On most systems you may access the BIOS settings by pressing the <del> key on your keyboard shortly after rebooting. If implemented by the BIOS as a separate feature you may also have to change the BIOS's boot sequence.
 
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