turn signal not working

2005 grand prix.......front turnsignal isnt working the parking light works but no go on the turn signal i chaged the buld 3 times and its not the bulb an idea's....if i cant figure it out o well thats what warrenty is for!
thanx

Might be the "multi-function" switch. It was a recall issue on us Grand Am's and it seems like I've heard of other GP's having problems with it. Not sure where it is on your car, but it sounds like it could've caused your problem.