Beep sound(5 count) on startup

Hi,

My laptop is a Dell Insipron 15z touch ultrabook and it is beeping during the startup everytime. This happens even when i hibernate and then re-login. It beeps in a count of 5 times  each and it continues forever until i restart it again.

On running diagnostics i found the below error code:

error code : 2000 0142

validation 87359

Please let me know what the problem is.

Thanks,

Ramesh