Client script is not working on my Instance.

[aakankshapl]

Hello
On my instance any type of client script is not working. My story is stuck from two days because of this issue.
What could be reason and solution for this to resolved.
Your help will be alot for me 

Thanks & Regards,
Aakanksha Lavande

[aakankshapl]

Still it's not working on existing form.

[Amit Pandey]

This will work onChange