My MacBook air does not start please help me sir

How far does it get in starting? Here's a list of articles describing issues at various stages during the startup process:

'If your Mac won‘t turn on' at all click here --> https://support.apple.com/HT204267

"If your Mac doesn't seem to turn on after you press the power button, follow these steps."

If your Mac starts up to an Apple logo or progress bar - https://support.apple.com/HT204156

Select your issue from the list on this support document --> "If your Mac doesn't start up all the way" click here --> https://support.apple.com/HT204156

Will the computer do anything?

See if anything here helps.

Computer Won’t Turn On