Hello anee,
beep tones frequency and type tells various of faults,
Step 01)
Remove the battery and press and hold power key 15 sec
reinstall battery and press power button as usual to turn on you laptop
if it is not works,
step 2)
Clean the RAM cards [guide|28195|Here] you can find the guide.
reinstall RAM(s) and power on you laptop
Let us know if above steps not works for you. if it is we need to get good idea about type of beep tone
Cheers!