I purchased a MacBook (Black) in September of 2007. Everything worked fine. The beginning of this week I opened up Photobooth and the screen was black. I couldn't take any pictures. Also video chat in iChat did not work as well. The iSight camera is detected in the System Profiler and the green LED light does turn on when I open photobooth or iChat. I ran a hardware test and no issues were found. I reset the SMU and the PRAM and all that. I contacted AppleCare and did all the troubleshooting again. I also started a test account to see if it was a user issue and it was not. AppleCare determined it was either a software/driver issue. I was wondering if anyone had any information about this kind of problem? I'd rather not reinstall the Mac OS 10.5 on my computer. Is there a way to reinstall the iSight driver? Thanks for any help.