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Why does my computer freeze when videos or games are running?

Hello!

So I have had great experiences so far with my MacBook Pro. It has been very reliable and more importantly my computer has always been running smoothly. However, recently there have been a few problems with my macbook and I am having trouble shooting the problem.

Whenever I play a video on Youtube or even on VLC (sometimes), my computer seems to lag significantly. In addition, my computer has begun to heat up unusually where the power cord is. Furthermore, I'm not sure how relevant this is, but when I am playing League of Legends my FPS (Frames per Second) used to be around 40~50, but now it is in the 1~10 range. Even when I am surfing the web on Facebook or using iMessages, my computer has begun to freeze or lag incredibly.

Any and all comments/diagnosis/suggestions are appreciated! Thank you guys!

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have you update the os or anything recently?

the cocktail of troubleshooting i would try is

1) boot into your recovery partition with Command-R on boot (assuming you are on Lion or later)

2) select disk utility and select your Macintosh HD (or your boot partition) then under the first aid tab choose repair disk and let it run. then repair permissions and let that run :).

the next thing i would try is to reset PRAM by hold Command+Option+P+R on boot

after that reset SMC and steps to do that can be found here http://support.apple.com/kb/HT3964.

let me know if any of those show any improvement to your symptoms :).

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Andrew You さん、ありがとうございました！
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