If the computer does not turn on when the power button is pressed, try the following troubleshooting steps.

Try turning the computer on again, after following one or more of these steps:

• Press and hold the Fn key and then press the F5 key repeatedly. If an image appears on the display, it indicates that the image had been switched to a connector for an external display monitor, causing the computer to only appear to be turned off.
  
  
• Connect the AC adapter to the computer.
  
  
• Remove the battery and disconnect the AC adapter, and then connect only the AC adapter. Make sure that the AC adapter is the one that was packaged with the computer. Try turning the computer on again, without the battery in the computer .
  
  
• Plug the AC adapter into a different AC outlet.
  
  
• Charge the battery, to insure that is has enough energy to start the computer.
  
  
• Press and hold the power switch for ten seconds (to make sure that the computer is off). Wait for five seconds, and then press and hold the power switch again, for three seconds (to turn the computer on).
  
  
• Make sure that there is nothing (like a sliding plastic cover) in the way of pressing the power switch.
  
  
• Disconnect all external devices (printers, pointing devices, keyboards, etc.) connected to any of the computer's ports.
  
  
• Remove any additional memory, beyond the computer's built in memory, or the computer's first removable memory module. If the computer starts correctly, re-insert the memory and turn the computer on again. If it does not start correctly, the memory may be inserted incorrectly, or it may be defective, or the memory socket may be damaged. Try replacing the memory module.
  
  
•  If the AC power light is blinking, try the following steps:

1. Cut off power to the computer by disconnecting the AC adapter and removing the battery. The error condition will be interrupted, and the AC power light will stop flashing.

2. Put the battery back into the computer. Don't connect the AC adapter. Try turning the computer on again. If the computer starts normally, the AC adapter may be defective. If the AC power light starts flashing, remove the battery, and continue with the steps below.

3. Connect the AC Adapter to the computer. Leave the battery out of the computer. Try turning the computer on again. If the computer starts normally, the battery may need charging, may be depleted, or may be defective. Turn the computer on, insert the battery, and then leave the computer running for several hours, which will deliver a slow, steady 'trickle-charge' to the battery. Once the battery has been trickle-charged, it may begin working correctly again. If the trickle-charging does not prove effective, see our Support Bulletin Step-Charging the computer's battery.

4. Connect the AC adapter to a different power outlet, preferably in a different room. If the computer starts normally, there may be a problem with the AC outlet itself, or the voltage level available from it.

5. Verify that the AC adapter is the correct unit for this model computer. The computer may not be able to start from an AC adapter that is rated for less current (amperage) than the computer requires, even if the rated voltage is correct, and the plug fits correctly in the AC-in socket. The labels on the bottom of the computer and the AC adapter will show the specifications for voltage ("V")and current ("A") for each device. The voltage level must match exactly. The amperage rating of the AC adapter must be equal to or greater than that required by the computer.

See also these related Support Bulletins:

• Blank screen, and blinking Power On light
  
  
• No image on LCD display

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