touch bar is not working/facing problem

sravankumaralli wrote:

while using touch bar i am unable to see the display but it is working

It could indicate a hardware problem...

you can try on an Intel Mac(?)

resetting the SMC Reset the SMC of your Mac - Apple Support see the details.

resetting NVRAM/PRAM Reset NVRAM on your Mac - Apple Support

on an M1/M2 Mac(?)

try a SafeBoot Use safe mode on your Mac - Apple Support to sort the issue

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"

Genius Bar Reservation and Apple Support Options - Apple

Outside the USA

Contact Apple for support and service - Apple Support