Hi,
I also had the same problem with my dell inspiron m5030 which I bought lss than a year ago. One day it was fine, the following day, it started beeping when i tried to turn it on. I took it to be repaired and apparently its the motherboard that was bad. Cost me like $200.00. My advice, buy another one or dispose of it if you can. I was told that there was no guarantee for the laptop lasting longer even after the repairs as its components are cheaply made.