System shuts down almost immediately after startup

  1. Disconnect all external peripherals.
  2. Make sure a known-good battery is fully inserted. Check battery charge and make sure that at least two LED charge indicators light up; otherwise connect the adapter. The adapter LED should light when plugged in. If not, consult the "MagSafe power adapter" symptom for further troubleshooting.
  3. After charging for a while, if the battery does not seem to charge, or if it is charged up but quickly discharges, replace the battery. Verify with a known-good battery.
  4. Check battery connection to logic board, and check cable attachment to connector.
  5. If just before the system shuts down, the sleep LED briefly comes on, check the thermistor cable connection between the heatsink and the logic board. It should be fully seated with no damage to the wiring. If damaged, replace the heatsink.
  6. Replace the logic board. Battery won't charge
  7. Plug in the power cord for five minutes to revive a drained battery. Refer to Knowledge Base article 304301: "MacBook and MacBook Pro: Battery not recognized after being fully drained."
  8. Check for correct battery insertion and reseat.
  9. Remove any connected peripherals.
  10. Try known-good power outlet.
  11. Try known-good power adapter and power cord.

Note: Verify that power adapter connector LED glows amber or green. If the LED is green, turn the computer over and press the battery button. The battery lights should glow green and stay on if the power adapter is operating correctly.

  1. If the computer is on Mac OS X 10.4.8 or later, check to see if the latest Battery Update has been installed. Do not replace a battery unless Battery Update 1.2 (or later) has been installed. For complete instructions, refer to Knowledge Base article 305256: "About Battery Update 1.2."
  2. For retail or dispatch service providers only: Be sure to record the Full Charge Capacity (FCC) and Cycle Count values in your case notes. If the computer is on Mac OS X 10.4 or later, these values can be found in Apple System Profiler: Hardware: Power: Battery Information.
  3. Try known-good battery.
  4. Reset the SMC. See Knowledge Base article 303319, "Resetting MacBook and MacBook Pro System Management Controller (SMC)'; Resetting the SMC means you will also need to reset the date and time (using the Date & Time pane of System Preferences).

Warning: Make sure you do not hold down the "fn" key when resetting the SMC.

  1. Try known-good MagSafe DC-in board and cable assembly.
  2. Replace battery connector with sleep switch.
  3. Replace logic board.
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  • Lea
    Why does macbook shut down on startup?
    8 years ago

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