Why does my compaq make crackling and tweeting noises

When the computer is first turned on and iv put in my password it starts crackling and churping and freezes up. So i shut it down and start it in safe mode and the noises stop.
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More about compaq make crackling tweeting noises
  1. There was a small bird caught in a case fan. The reboot killed it. :(


    The only movable parts in your computer that can chirp are a standard hard drive or a fan... crackling is another story I suppose.
  2. Power supply or bad caps on motherbaird.
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