Is your sound card detected in AE Preference panel ?
What is your configuration ? Mac or PC ? Do you have special audio hardware ?
Audio is not directly supported in AE. You must set audio preview.
See the manual for AUDIO and PREVIEW.
I have a pc, not mac.
And i have still no sound
any step by step guide?
Does AE detects your sound card (in Preferences) ? If not
it's a driver problem. If yes, you should have sound when audio prviewing (the . key on number pad), Ram Previewing and Ctrl/cmd scrubbing.
If not try with another audio file from different source (like a wav file, an mp3). If still no sound, sadly I can't see what's going wrong.