Hi @maifujshaikh
Here's a [https://www.dell.com/support/kbdoc/en-au/000131044/diagnostic-and-battery-indicators-for-dell-latitude-laptops-and-tablets|link] that may help.
Scroll down the page and click on ''Dell Latitude E-series diagnostic LEDs'' to see what is written about how to check what the light means.
Depending on what version your laptop is you may have to select either ''Shipping'' or ''Legacy.''
Post back here with what you have found to get more help if necessary.