Computer doesn't post; loud whining noise in cpu area

Hi, I've got an HP with a E6700 2.6 ghz that worked perfectly till two days ago. Now it doesn't even get to post and a loud whining noise comes from the cpu area. Switched out cpu's same symptoms. pulled all cards same thing. No disk activity just noise and not from fans. Any thoughts? Troubleshooting tips?
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More about computer doesn post loud whining noise area
  1. Where is the noise coming from? From a small chipset fan? Perhaps it's a small piezo "speaker" making an alarm noise? (that would look like a small fat black cylinder with a small hole in the top)
  2. Might be a piezo thing. I have the cooling fan removed (still plugged in though) and listening through a straw to try to pick out the exact location points to the CPU, which I find hard to believe. It's a pretty loud noise too, louder than a fan - a veritable squeal. I've popped out all the cards (8800gt, modem(!), tv.) And popped the memory out too. Still the same noise. Put in a prior original cpu (1.8 ghz) and it makes the same noise and no post. Power up without the CPU and it makes no noise at all. Next step is to substitute a known good power supply... maybe a rail's gone down. All the caps look good.

    Never heard this noise (loudness, frequency and location) out of a computer before... and I'm an old fart.

    Mobo's an HP/Asus P5BW-LA(Intel Socket T LGA775, P965 Express, Micro ATX, 4GB DDR2, 1066MHz FSB)

    Thanks the the tip Mondo man.

  3. Hopefully you're not turning on the computer with a CPU installed but no CPU cooler attached to the CPU! That'll fry the CPU in no time.
  4. No CPU, no noise... Just a guess, but sounds like one of the components in the VR circuit is going.
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