The boot menu...is simply a listing of user preferences for what device the system should try to boot from. Normally, the boot menu has 3/4 options, with routine choices being floppy disk, CD/DVD, hard drive.
The boot menu appears as part of the BIOS settings
If you booted the system and it immediately went to the BIOS...I'd have to say that you need to check and see if the hard drive is properly detected (first) and then if the hard drive is one of the boot options (second).
When the system is booted, it will cycle through the listed boot options (in the order in which they are listed) until it finds a suitable device. If it finds no such device, it will not boot.
Something went wrong with your start...I suggest going into the BIOS and examining the basic settings I mentioned.
How to get into your computer's BIOS - http://www.cyberwalker.net/faqs/reinstall-...enter-BIOS.html
Howstuffworks How BIOS Works - http://computer.howstuffworks.com/bios.htm/printable