@chamal ,chamal , Try a reset turn computer off press and hold down the start button until powered down. Now unplug the computer and remove battery. Press and hold down start button for about a minute then release. Re install battery and plug in. Press the start button, should power on correctly with display. May have to try this reset procedure a couple times.
If still not booting up and beeping perhaps try reseating the ram(open computer and remove Ram sticks and insert back in slot and lock down) try computer. Still no go, issue may be bad components inside computer, mother board,etc., may require a good shop to check out, diagnose, estimate repair. Video link shows how to remove battery and Ram to reseat. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.