My macbook won't turn on

From your description the cabe from Charger to computer is the Older MagSafe type of connector. Check the computer where it connects for debris or dust and blow if out. Also examine the Male Connector on the cable for bend, broken or missing Pins. If any of these conditions exist - time to purchase a new Cable

Krishnarj00 wrote:

My macbook won't turn on and when I put charging pin in it no light showing on changer and macbook fully discharge

If your Mac doesn't turn on

Apple Portables: Troubleshooting MagSafe adapters

https://support.apple.com/en-us/HT203207