Can't record audio...

I don't seem to be able to record audio with my microphone to flash media server. Every time I try a 1kb flv file is made, but it is empty when I try to play it back, and basically doesn't work. I didn't install apache server when I installed media server because I already have it installed. Could this make a difference? My code is below. Any ideas?

package {

    import flash.display.MovieClip;
    import flash.net.NetConnection;
    import flash.events.NetStatusEvent;
    import flash.events.MouseEvent;
    import flash.net.*;
    import flash.media.Microphone;
    import flash.system.*;
   
    public class HelloServer extends MovieClip {
             
      private var nc:NetConnection;
      var myNS:NetStream;
      var mic:Microphone;
      /*
       *  Constructor.
       */
      public function HelloServer() {
            // register listeners for mouse clicks on the two buttons
            connectBtn.addEventListener(MouseEvent.CLICK, connectHandler);
            closeBtn.addEventListener(MouseEvent.CLICK, closeHandler);
      }
     
      //Once Connected
      public function connected():void{
       
        myNS = new NetStream(nc);
        myNS.attachAudio(mic);
        myNS.publish("alex" + Math.random(), "record"); 
      }
     
     /*
      *  Connect to the server.
      */
     public function connectHandler(event:MouseEvent):void {
             mic = Microphone.getMicrophone();
            //Security.showSettings(SecurityPanel.PRIVACY);
            mic.rate = 22;
            mic.setUseEchoSuppression(true);
           
            trace("Okay, let's connect now");
             nc = new NetConnection();
            nc.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
            nc.connect("rtmp://localhost/HelloServer");
     }
    
    
     /*
      *  Disconnect from the server.
      */
     public function closeHandler(event:MouseEvent):void {
            trace("Now we're disconnecting");
            myNS.close();
            nc.close();
     }
    
    
     /*
      *  Handle events relating to the server connection.
      */
     public function netStatusHandler(event:NetStatusEvent):void {
            trace("connected is: " + nc.connected);
            trace("event.info.level: " + event.info.level);
            trace("event.info.code: " + event.info.code);
           
            switch (event.info.code)
            {
                case "NetConnection.Connect.Success":
                    trace("Congratulations! you're connected" + "\n");
                    connected();
                    break;
                case "NetConnection.Connect.Rejected":
                    trace ("Oops! the connection was rejected" + "\n");
                    break;
                case "NetConnection.Connect.Closed":
                    trace("Thanks! the connection has been closed" + "\n");
                    break;
           }
     }
   
   
   }
}