Computer Randomly Locks Up?

Over the last few weeks, my computer has started to randomly lock up at different times. I can be doing anything; from playing games to browsing the internet and it might still do it. It seems to often happen, not always though, when I begin to watch a video. Sometimes the computer locks up even when I wake it from hibernation mode. I don't know what it could be? Graphics Card?
I've already tried formatting and reinstalling, makes no difference!

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More about computer randomly locks
  1. run hd tune check the smart warning on your hard drive. run memtest86 from a boot disk to see if it a bad stick of ram. run open hardware monitor check your temps and voltages.
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