Suddenly can't play any web videos

I've had my Macbook Pro for over a year and out of the blue it has just stopped me from watching any videos online, e.g. facebook, youtube, one channel etc. I've updated my flash player, reset safari and firefox, restarted a million times and checked disk utility. I don't know what's gone wrong, someone help!! When I try and watch a video it is normally just a black screen, but if it does load at all it is never more than 3 seconds

The short version:
Go to Applications>Utilities>Disk Utility and select your volume and then select Repair Permissions.
Same directions are also in the OS Mac Help Menu.
The long version:
Save and/or quit your applications & doucuments
Go to Applications>Utilities Folder
Click Disk Utility
Highlight your STARTUP HD.
Click the Repair Disk Permissions button. (Don't worry about verifying)
At the bottom of window when the repairs have finished, you will see the “most important thing”:
Permission Repairs CompleteThe previliges have been repaired or completed on the selected volumn.
Restart your computer (Optional).

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