Clutch trouble

Shifting into third at high revs I heard a pop after which my clutch would not respond. It feels like the plates are not opening. My 944na wont get in any gear except for first and second (the engine has to be on or else those two wont work either). Can anyone offer any insight as to what might have happened.

[Martin Taylor]

Probably a broken release fork (does happen) if not that then the hydrolics have failed. You could have a look underneath while somebody pushes the pedal to see if the hydrolics are working.