What are the BIOS beep codes and what do they mean?

One short beep indicates a VGA detected, quick boot set to disabled, or no keyboard detected. One continuous beep followed by two short beeps then a pause (repeated) means no memory was detected. One continuous beep followed by three short beeps means no VGA was detected, and one continuous beep followed by four short beeps indicates a hardware component failure. (Page 2-16)