HT1338 why is my macbook freezing when i use youtube and how can i fix it

Everytime I use anything besides Facebook on the internet my screen goes black and the noise skips or repeats itself and I have to press the power button and reboot. It happens probably 20 times a day and I took it to a genius appointment and they couldn't find anything wrong with it. Do I need to update my software or is it a virus or internal problem? I have no clue what to do at this point, I am really clueless and it is frustrating that I paid $2,500, have had this only since spring of 2010, and it will not work properly. Thanks for anyone who has any input or advice!

There is a little free tool that makes it easy to find the cursor:
It is called Mouse Locator,
it sits in System preferences after install, try it and look at the interesting settings.
Works in SL, Lion and ML.
If you do not like it throw it out again.

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