|If you're talking about a computer beeping during the POST at the begining of the bootup, chances are this is a "beep" error code.|
Depending on BIOS manufacturer, different beep sequences mean different things. For example, one long and two short beeps might mean there's an issue with the RAM. The only way to know for sure is look up the beep code's for your BIOS.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.