Dead Machine Problems

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  A4000 does nothing on power-up; keyboard light, power light, and hard drive
  spin-up show that power supply is working, but screen is gray or black, and
  disk drive doesn't click.

  Possible cause: the processor board is not firmly connected to the mother
  board, or has worked its way loose (the power LED may flash quickly in this
  situation). Reseat the connector strip that is parallel to the floppy
  drive. Since this connector is quite long, it is possible for the ends to
  be firmly attached while the center is not making adequate contact. Be
  careful not to flex either board too much while reconnecting them; using a
  large rubber eraser or other flat object will protect your fingers while
  pressing the boards together gently. In extreme cases, it may be necessary
  to use a contact cleaner to clean accumulated gunk (like silicon heatsink
  compound) from the connectors.

  Possible cause: the motherboard is not supported very well near the
  internal IDE connector. Solution: gently lift the motherboard near this
  connector. Installing an insulating support underneath the motherboard near
  here will be a more permanent solution.

  Possible cause: badly-trimmed pins of the soldered power supply connector
  have poked through the insulating plastic under the motherboard and shorted
  to the case. Solution: trim the pins and install more insulating plastic.

  Possible cause: power supply failure. A company called Micro R&D repairs
  and upgrades power supplies. Contact them at:

    Micro R&D
    721 'O' Street
    Loup City  NE  68853
    (308) 745-1243