Hello Everyone !!
Prior to my connection with projector, the system sound was perfect and working but now there isn’t any sort of system sound coming even after I am not connected to projector. Speaker is working well when I play music in audacious or spotify or in browsers. It’s just this system sound I used to receive before like while connecting to charger or increasing sound setting.
I don’t know if it is relevant but I have this new “Manage Desktop and Panels” Option in edit mode which shows this. It didn’t exist before… it just came right after connecting to projector
Hope you have an amazing day 
Edit: The file that is played when events happen is being played when opening the source file. But it doesn’t play in file.