Dell Inspiron 4 times Beep at startup with black screen:(

Hello Everyone, yesterday i started my laptop and it's give me black screen at startup.After 1 minute my laptop beep 4 times and then stop.After 2 seconds my laptop again beep 4 time and again.again.

I really sad about this.can anyone please help me to fix it?

My Spec:

Dell Inspiron Corei3 n5050

4GB RAM

500GB Hard Disk

Intel hd graphic 3000

Windows 10 Pro Operating System

I also try everything to fixed it but nothing can do to fixed it:(

Please help me???????