3 beeps 1 long 2 short

Hello,

hey guys im having a prob here... while im playing a game or do something on my PC (W7 os) suddenly comes up black screen, like u put ur PC on stand by...than comes up 3 beeps : 1 long (beeeeeeeep) 2 shot (beep beep) than i cant do nothing... so i have to restart my pc... so plz replay me on my e-mail... plzzzzz Your email address has been removed for your own security.
tnx :D hope i get some answers!! :D