Blown turbo??

[aggyj17]

I bought a hdi a few weeks ago now with a cutting out issue so I have gave the car a service and cleaned the fpr and took ot out for a test drive and then all of a sudden I heard a bang ( like a boost hose blowing off) so I stopped had a quick look at the car and nothing obvious but now the car still boosts fine but there as a loud wirring noise and the more a rev it the louder it gets have I blown the turbo or is it something simple??
Can someone point me in the right direction thanks