How to Set BIOS to Boot from CDROM:
All modern Computer Systems manufactured in the last years, support boot from cd feature, but it may be required to configure this feature in bios or previous owner of your computer system may have disabled this feature or may have changed the boot priority sequence )
When you start your computer, check the boot-screen for setup key, In most newer pc it will be DELETE key or F2 or F10 so make sure to check it.
1.Change the BIOS boot order so the CD or DVD drive is listed first. Some computers are already configured this way but many are not.
If the CD or DVD drive is not first in the boot order, your PC will start "normally" (i.e. boot from your hard drive) without even looking at what might be in your disc drive.
2. Insert your bootable CD or bootable DVD in your disc drive.
3. Restart your computer.
4. Watch for a Press any key to boot from CD or DVD... message.
5.Your computer should now boot from the CD or DVD disc.