Solving power problems

Use this information to solve power problems.

Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of an overcurrent condition. To diagnose a power problem, use the following general procedure:

  1. Turn off the server and disconnect all ac power cords.
  2. Check the power-fault LEDs on the system board (see System-board LEDs).
  3. Check the LEDs on the operator information panel (see Operator information panel).
  4. Check for loose cables in the power subsystem. Also check for short circuits, for example, if a loose screw is causing a short circuit on a circuit board.
  5. Remove the adapters and disconnect the cables and power cords to all internal and external devices until the server is at the minimum configuration that is required for the server to start (see Power-supply LEDs for the minimum configuration).
  6. Reconnect all ac power cords and turn on the server. If the server starts successfully, reseat the adapters and devices one at a time until the problem is isolated.

If the server does not start from the minimum configuration, see Power problems to replace the components in the minimum configuration one at a time until the problem is isolated.