Hello Vinamra11,
I am sorry to hear you are having issues with your embedded Leap Motion Controller. When you hit FN + Spacebar in combination does the device no longer activate? You should see a white light near the device if it is on.
If you have already attempted the above, you can also try uninstalling and re-installing the Leap Motion Software. You can download a copy of our installer through the following link.
https://www.leapmotion.com/setup
Please let me know if the above helped to resolve your issue.