ok so i should go back to the warranty shop? no other way?

The drivers posted were the ones BenQ listed for your laptop.

If they don't work and the laptop is still under warranty I'd take it back in.

The only other things to check is that you do not have it muted in any way.

Have you checked the Sound/ Audio settings under the Control panel?

yea checked. nvm i will bring it in. thx jephree

no problem.

let us know how it goes.