What causes Disk Boot Failure?

when i starting my computer, it starts as it normally would but but i don't think it starts.

verifying DMI Pool Data and then Say
Boot from CD :
Disk Boot Failure, Insert System Disk and Press Enter

I tried to look into the BIOS and it seams that it doesn't recognise either DVD writer and not even the Hard drive. I have even tried uninstalling and taking out the CD drive but then the system just doesnt load any XP till the CD is put right back in place.

Can anyone tell the solution and also I want to know what causes disk boot failure?

Hi,

Causes of Disk boot failure:

This issue could be caused by any of the following possibilities.

Boot options are not set properly in CMOS
Non bootable CD or CD-R in computer
All boot devices set are not bootable

This happens when boot options are not set properly in cmos.

Verify that the boot options within CMOS are set properly. Below is an example of how we recommend the boot options be set.

Floppy drive
CD-ROM drive
Hard Drive
Other / Network
NON BOOTABLE CD OR CD-R IN COMPUTER

Verify that no CD or CD-R is in the computer possibly causing the computer to attempt to boot from that disc.

Remember all boot devices set are not bootable

Select floppy drive from boot options and then put bootable floppy in floppy drive.

You can get useful imformation from here.

http://forums.techarena.in/vista-help/829517.htm

By the way, what brand of computer is this? If it's a custom built computer, what is the motherboard brand and model?