Why does pushing the clutch make the noise go away?
 

I own a honda civic dx 1997 coupe and when i start the car theres a whirring noise coming from the transmission I searched this question and found one similar except i just replaced the clutch and the bearing and all that is brand new but the noise is still there i didnt resurface or replace the flywheel though does anyone think that could be it ? Please auto-mechanics answer i really need to fix this problem thank you all !

Sounds like the flywheel needs replacing to me xx

Maybe forgot to but a new throw out bearing or the new one is defective.

You're not making any sense. How can you start the car and hear a noise if you don't have the clutch pushed in?