iSight Issues on Late 2008 MacBook Pro-Please Help

I am having issues where my iSight Camera will work and then not work. This happens in all applications that use the iSight. I have tried resetting the PMU, zapping the PRAM, and creating another user and logging in as that user...all with the same results. I wanted to know if there was some other fix I could try as this is my second replacement MacBook Pro. The first one I got Apple replaced because of manufacturing defects (slanted keyboard and loose battery door) a week after I bought it and now this replacement one which is less the three months old has a bad iSight camera. I really don't want to send it in for repair so if there is another fix I can try, please let me know. I am getting really frustrated with Apple's lack of quality these days.