This happened to my friends dad. He was playing around with his mo. and it beeped. He said it was broken or something.
Not sure if it was to do with the RAM slot / cards. But i'd double check.
1. Jim Parsons
2. Arnold Schwarzenegger
3. Adidas
4. Tom Lister or Ewan McGregor
Just correcting from above and below. Don't really know if its right. But eh.