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P4 board no POST with sirens. (BD7/BL7/BW7 and other P4 boards)



Why does the BD7 board fail to POST with sirens? Is the mainboard faulty? (BD7/BL7/BW7 and other P4 boards)


  1. If the CPU retention unit or heat sink wasn't installed correctly, the bad heat dissipation will cause P4 CPU over temperature and fail to boot up.
  2. Please check the black CPU retention is fully inserted into the holes in the mainboard. Below picture illustrates a bad installation- there is a gap between retention unit and mainboard.

  3. Please make sure the white nails were fully inserted and can prevent CPU retention unit from loosen.

  4. Double check the back side of mainboard. If the feet of CPU retention unit and white nails were correctly installed?

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