Question about Apple MacBook Pro Laptop Computer with Intel Duo Core 15.4 Inch PC Notebook
Firstly, connect an external screen to the DVI connector on the right-hand side of the laptop. This will determine if the graphics processor is functioning.
If the external screen functions correctly, then the problem is in the laptop display.
If this is the case, shine a torch at the screen to see if the desktop is visible. Failure of the backlight will cause the screen to appear dark but the desktop is still displayed very dimly.
If you can't see the desktop with the torch, then the screen is at fault and will need replacing.
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
Most likely fix is to reset the SMC.
Turn the power off, remove all peripheral cables, connect the AC power supply. Using the left-side keys, press the combination Shift-Control-Option-powerbutton ONCE. The LED on the MagSafe connector
should go off, go back to green when keys are released, and may change to orange if the battery still needs some charge. Wait five seconds, then press the power button to restart the computer.
Posted on Jan 21, 2010
SOURCE: MacBook Air 11" won't power
1. Verify AC power presence with MagSafe LED
indicating on or charge state.
2. Verify battery as being partly charged, with orange/amber LED on MagSafe power connector.
3. Reset SMC
Resetting the System Management Controller (SMC) The System Management Controller (SMC) is a chip on the logic board that controls all power functions. If the computer is experiencing any power issue, such as not starting up, not displaying video, sleep issues, or fan noise issues, resetting SMC may resolve it. To reset SMC: 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. Note: If bottom case is removed, you can alternately reset SMC by disconnecting both power adapter and main battery, and holding down power button for 5 seconds.
Power Adapter Issues 1. Connect AC adapter's MagSafe connector to the computer. The LED on the connector should be green or orange/amber. 2. Verify power cord or duckhead is firmly attached to AC adapter. Check that duckhead is not damaged. 3. Verify AC power source is supplying AC power. 4. Check for dirty or stuck pins on the MagSafe connectors, both on the adapter and the computer. 5. Reset SMC by pressing the (left) Shift-ControlOption(Alt) keys along with the power button once.
Posted on Mar 01, 2011
You could try using the startup sound preference pane located here: http://www.macupdate.com/app/mac/16425/startupsound.prefpane
Posted on Mar 07, 2011
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