It is a system problem. There is only really one way to fix this.
You'll need to start your mac up from the original OS install disk.
You can then use the disk utility to see if the OS can be fixed or you might need to re-install the OS. Once you have started up from the install disk you might be able to see your drive. At this stage if you have not already done so you should back up those important files.
I have just recetly got a samsung laptop and the webcam doesnt work on msn i have tried clicking on...
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I have just recetly got a samsung laptop and the webcam doesnt work on msn i have tried clicking on tools and audio video but it comes up unable to open audio video setup i have tried everything? what shall i do ?