GPU slower after crash and wont over/underclock anymore

well i recently overclocked my GeForce 8400GS and it was running perfectly but out of nowhere i got a blackscreen and after a few seconds it came back with a message saying something about my video card stopped working but was recovered successfully but has dropped well below it orginal clocked speed and now isnt effected by me trying to over/under clock it again no matter what i do. Any help?
using win7 ult and overclock software is msi afterburner
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More about slower crash wont over underclock anymore
  1. i think it reached a very high temp :o i think it will die soon
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