hi guys, i hope someone can help me with my problem, here it goes, when i turned on my mac the green light beside the built in web cam turned green, so when i want to use my web cam for chatting with my yahoo messenger the web cam turns on but it show only black it doesn't catch any video it only stays black. i log off from my ym then i tried my photo booth but it is still the same. i restarted my mac but the light is still there. can any one enlighten me with my problem? thanking you all in advance for the advance help that i will receive.