MacBook won't play audio/video

My MacBook won't play any audio or video. It also won't open iMovie and when I try to open a photo in iPhoto/Preview, it goes blank. I have tried updating it, reinstalling the flash, using firefox/google chrome etc. I have no idea what is causing this. Is there a way to fix it without having to actually take it into the Apple store? I would appreciate any suggestions! Thanks in advance!

Hi there thwatts,
You may find the troubleshooting steps in the article below helpful.
iTunes: Troubleshooting AirPlay and AirPlay Mirroring
http://support.apple.com/kb/ts5209
-Griff W. 

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