System locks up after 15 minutes

I bought an online kit thru tigerdirect,with an asus motherboard(m2n68-am plus)and have problems with it locking up during use.Is this a bad motherboard,processor,or what?
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More about system locks minutes
  1. heat?paste ?
    My first PC I ever built used to do that years ago
    I forgot the paste - lesson learned
  2. I used the paste,installed an extra fan just to make sure that I had adequate cooling.
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