Welcome to Tom's Hardware, A little more information will be helpful here.
1) What are the computer's specs?
2) Do you have it overclocked or Turbo Boost Setting applied?
With that information, we'll have something to work from
Does it have a clear cmos button? If so push it to reset to default and see it that helps. If not either use the clear cmos jumper or remove the cmos battery for a couple of minutes - after unplugging it from the wall and pushing the power button to remove any residual memory - re insert the battery and see if that worked.