What type of sound? A beep?
If so, then you've got a speaker installed in your computer, and the beeps are warning messages processed by your POST/BIOS.
Count how many beeps there are, if they loop and if they are short/long or a combination.
Find out what the brand name of your BIOS/POST is and find a list of what each beep means.
I am not being rude, just trying to give you some incentive to work out the problem yourself.