Video and Audio Issues

I am having troubles with playing videos and audio on my macbook pro. When attempting to play videos, the video generally stops playing after 2-3 seconds. The audio starts out choppy and eventually doesn't work at all. This issue persists on all browsers (safari, chrome, firefox), with both flash and HTML5 players. HTML5 players generally seem like they are fast forwarding for 5 seconds then stop. I have tried re-installing flash player and clearing the cache, but that does not fix the issue. I have also logged into a guest account and the issue still persists. Any advice on how to fix this would be welcomed, thank you.
  Model Nam
  L3 Cache: 3 MB
  Memory: 4 GB

I have also tried getting rid of add-ons as well, which doesn't work either. Any ideas?

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