Bike Noise

okay, I ride a carbon bike with carbon forks and lately whenever I get out of the saddle to climb it starts making a creeking sound.  The frame is not cracked , at least not that I can find and have also had it checked by a bike mechanic this past spring.  Anyway, I'm sure the noise is coming from the headset or forks...at least that's where it appears to come from.  Again, only when I climb out of the saddle do I hear anything.  Also, I don't ride this way but I was doing some trouble shooting while riding, and when I lift up on the bars when climbing the noise is gone.  So it appears that the noise is there when I put forward pressure on the bars.  The noise can get pretty anoying as I like to climb out of the saddle.

Anyone else experienced this sort of thing? Any suggestions?