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I have a Macbook air. It was working fine but last time I used it I shut it down and now when I press on the power button I can hear the startup sound but the screens stays black and then it shuts down

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Sounds like a power supply problem, or mother board. Hope it's the power supply!

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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Hpw to reset macbook pro


  1. Turn off your Mac (if it isn't already off).
  2. Hold down these four keys right after you press the power button: command+option+P+R (that will reset the PRAM).
  3. Keep holding down those four buttons until your Mac restarts and you hear the second startup chime.

May 28, 2014 | Computers & Internet

1 Answer

Hi,\r\ni have a problem with my macbook air when


Try restarting your computer while holding down the X key. This may force the computer to start up using your Mac OS X system. If it does, release the X key, then open System Preferences and click Startup Disk. Make sure your Mac OS X system is selected. If you are unable to start up using the X key, restart your computer and immediately press and hold the Option key. Release the Option key when icons start to appear in the center of the screen. Select the Mac OS X system disk, then click the forward arrow to continue starting up.
If the above attempts to reselect your Mac OS X startup volume are unsuccessful, try resetting PRAM. Shut down your computer, then turn on the computer and immediately press and hold Command-Option-P-R until you hear the startup sound for the second time. Open System Preferences, click Startup Disk, and select your Mac OS X volume.
Hope this helps. If none of these options fix your problem, bring your computer to an Apple store, they are always very helpful and almost never fail to fix the problem!

Mar 11, 2011 | Apple MacBook Air

1 Answer

Will not load up or take charge


Try removing the AC power, removing the battery and then holding down the power button for five seconds. On the MacBook Air, press (left) Shift-Control-Option along with the power button once. Note: You must use the keys on the left side of the MacBook Air keyboard.
If that doesnt work try this:
  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.

Mar 01, 2011 | Apple MacBook Air

1 Answer

When turn on MacBook air the screen is blue.I can't get into any icons.


Try to reset your SMC (System Management Controller) p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #1a1a18}
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1. If computer is on, turn it off by choosing Shut Down from the Apple menu.


2. Connect power adapter to computer and to a working power source.


3. On built-in keyboard, press (left-side) Shift-Control-Option along with power button just once. Important: Use Shift-Control-Option keys on left side of keyboard.

Note: When the LED on the MagSafe connector is orange/amber, resetting the SMC will change it to green for a few seconds, indicating that SMC was correctly reset.


4. Wait 5 seconds and press power button to start computer.


If it starts without beeping errors reset the PRAM (Parameter RAM)


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1. If computer is on, turn it off by choosing Shut Down from Apple menu.


2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in Step


4. Note: If keyboard does not have an Option key, use Alt key instead.


3. Press power button.


4. Immediately press and hold Command-Option-P-R keys.

Important: You must press this key combination before the gray screen appears.


5. Hold down keys until computer restarts, and you hear startup chime a second time.


6. Release keys.



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Dec 31, 2010 | Apple MacBook Air

2 Answers

My laptop has suddenly frozen, i turned it off by the power button and whenever i try to turn it on it turns white screen, then shutsoff after 3-5minutes.


Resolution
  1. Disconnect any devices connected to the computer including printers, hubs, and third-party keyboards or mice, and test the computer again by trying to turn it on.
  2. If you're using a MacBook or MacBook Pro, check the battery level. Press the small button on the battery or on the side of the computer. You should see lights indicating the battery's level of charge. If you see just one light blinking, the battery needs to be recharged. Use the computer with the adapter connected to recharge the battery.
  3. Unplug the power adapter from the electrical outlet and from the MacBook, MacBook Air, or MacBook Pro. Wait one minute. Plug it back into the wall first, then to the computer. Make sure the electrical outlet is working by plugging in another device (such as a lamp). When you plug the adapter back into the computer, the power adapter LEDs should light up green or amber.
  4. Inspect the MagSafe port on the computer for debris, such as metal stuck to the magnet in the port, which might prevent the connector from seating properly. On the adapter side, look at the DC connector for dust or other debris and check whether pins are missing, bent, or stuck down. If you find any of these to be true, see Apple Portables: Troubleshooting MagSafe adapters for instructions on cleaning the adapter.
  5. Make sure you are using the adapter that was designed for your computer. If you aren't sure or if you need a new adapter, learn which adapter is appropriate for your computer.
  6. Press the control key, the command key, and the power button simultaneously and hold for three seconds to try to restart the computer.
  7. Reset the PRAM. After pressing the power button, hold down these keys simultaneously: Command-Option-P-R, until you hear the startup chime at least one additional time after the initial startup chime.
  8. Reset the SMC for the MacBook And MacBook Pro by removing the AC power, removing the battery and then holding down the power button for five seconds. On the MacBook Air, press (left) Shift-Control-Option along with the power button once. Note: You must use the keys on the left side of the MacBook Air keyboard.
  9. If you recently installed additional memory, make sure it is correctly installed and is compatible with your computer. Remove the new memory to see if the computer starts up properly without it.
Also:
The MacBook SMC Firmware Update v1.1 improves the MacBook's internal monitoring system and addresses issues with unexpected shutdowns. This update is recommended for all MacBook systems, including those that received warranty repair.
You can use the Software Update feature of System Preferences, or download the MacBook SMC Firmware Update v1.1 from Apple Software Downloads.
Note: If your MacBook is running Mac OS X 10.4.6, you won't be able to see the SMC Update until you update to Mac OS X 10.4.8. Once you have updated your system software, the SMC Update will appear as an option in Software Updates.
MacBooks running Mac OS X 10.4.7 will be able to download and install the SMC Update, so it is not essential that you update your system software, although Apple always recommends updating to the latest version of the system software.
If your MacBook is in a state where it will not remain on long enough to install the update, wait for the issue to reproduce itself. Once the MacBook has turned itself off, turn the computer on by holding the power button down. Keep the button down until you hear a single long tone. Once you hear the tone you can release the button, install the recommended updates, and restart normally.

Dec 30, 2010 | Apple MacBook Mac Notebook

1 Answer

Macbook a1181 works for a couple days and then does not want to start again for another couple days. please advise


Your best bet is to reset the System Management Controller;
(I'm not sure if your model has a removable battery or not, so I'm providing both methods)

Resetting the SMC on Mac portables with a battery you can remove
Note: Learn about removing the battery on MacBook and MacBook Pro.

  1. Shut down the computer.
  2. Disconnect the MagSafe power adapter from the computer, if it's connected.
  3. Remove the battery.
  4. Press and hold the power button for 5 seconds.
  5. Release the power button.
  6. Reconnect the battery and MagSafe power adapter.
  7. Press the power button to turn on the computer.

Resetting the SMC on portables with a battery you should not remove on your own
Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).

  1. Shut down the computer.
  2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.
    Note
    : The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.



...and then reset the Parameter RAM:

  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.

Nov 17, 2010 | Apple 13-inch MacBook - Intel 2.0GHz Intel...

1 Answer

How do you start in safe mode? I started with power and shift. Then what do I do?


To start up in safe mode:

Shut down your computer and wait 10 seconds.

Press the power button.

Immediately after you hear the startup tone, hold down the Shift key.

You should press the Shift key as soon as possible after you hear the startup tone, but not before.

Release the Shift key when you see the gray Apple logo and progress indicator (spinning gear).

Nov 13, 2010 | Apple MacBook Mac Notebook

1 Answer

Startup switch on PB G4 17 not getting apple sound, takes numerous times to boot up. Using Tiger OS, upgraded to latest. Works fine, otherwise.


If a Mac is shut down while the volume is set to zero, the standard Apple startup chime will not sound, so it is impossible to say whether or not this symptom indicates a problem.
For a startup issue such as this, I would recommend zapping the PRAM and resetting Open Firmware.
To zap the PRAM, start with a powered-down machine, press the power button, then immediately hold down the four keys: command, option, P, R. After ten seconds or so, you should hear the optical drive reset, and then the startup chime (because the volume is reset to full by this procedure). Ten more seconds, another reset, another chime. After the second time you hear the chime, release the keys.
Shut the machine down again (if it doesn't start up successfully, hold the power button until the power goes off). Press the power button, then immediately hold down the four keys command, option, O, F. You will see some tech-speak on the screen, then it will wait for input. Enter the following three lines, pressing the "return" key at the end of each:
reset-nvram set-defaults reset-all
After the last line, your Mac will reboot itself. It should now boot much more reliably. If it doesn't, chances increase that you have a hardware problem. You may want to run the Apple Hardware Test from the DVDs that came with the PowerBook to check your memory and logic board. Failing this, you are in for a trip to the shop.

Oct 05, 2009 | Apple PowerBook G4 Mac Notebook

1 Answer

The loading 'logo' wont disappear. pls help.


Hold the power button down. Keep it down until the unit powers off. Then press power to start the machine up, and as soon as you hear the starting chime (boooong) press Command+Option+P+R and keep them held down until you hear the startup sound 3 times. Then you can let go and it should start normally.

May 02, 2009 | Apple MacBook Air

1 Answer

I cannot reset my mac notebook


Hello, sorry to hear you are having problems,
Why exactly do you want to reset your MacBook ?
well, whatever the reason, you simply press the power on button for 5 seconds or a little more and the mac will shut down.
If you want to reset the Parameter Ram, it's kind of acrobatic, you must power on the mac and then very very quickly press the following 4 keys :
cmd + alt + P + R
and HOLD them all down until you hear the startup sound over and over again at about a 30 second interval. Let it reset for 4 startup chims, then let go and let the mac boot....
YOU ARE RESET...

Mar 30, 2009 | Apple MacBook 13"White /2.0Ghz Intel Core2...

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