How to Reset the Battery Charger on a MacBook Pro

Power off the MacBook Pro and then disconnect the power cord.
Remove the battery from the MacBook Pro.
Press and hold the power button for five seconds.
Replace the battery and reconnect the power cord.
Power on the MacBook Pro.
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How to Open Up a Macbook (6 Steps)

Shut down all applications and programs. Turn off your MacBook.
Unplug the device from its electrical source. Disconnect all devices such as your mouse and music player.
Put the MacBook on a clean towel on a table. Flip it over so you are looking at its bottom.
Find the coin slot and turn it clockwise with the edge of a coin. The battery will pop up. Lift it out of the laptop.
Find the eight screws around the border of the MacBook. Unfasten these screws and note exactly where each is on the laptop.
Lift the case off the laptop. View the inside of the MacBook.
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How to Upgrade Your MacBook Air

Remove screws. The internals of a MacBook Pro are accessed form the underside of the casing. The bottom is held in place by ten screws, including six 3 mm Phillips screws, two 5.4 mm Phillips screws, and two 7.9 mm Phillips screws.
Lift off the case. Once the screws are removed, the bottom of the MacBook Air case should come off easily, with a quick pull.
Disconnect the accessory ports. Your MacBook Air's current hard drive or solid state drive sits underneath the ribbon that connects your accessory USB, audio, power and DVI connectors. With the bottom of the case removed, unplug the ribbon that connects these accessories to the motherboard.
Remove hard drive screws. Once the accessory ports are disconnected form the board, remove the screws that hold the hard drive frame in place.
Lift the hard drive frame. Make sure that the ribbon that attaches the accessory ports is safely out of the way. If the path is clear, the hard drive and its frame can be lifted from the computer.
Replace hard drive. With the frame and hard drive out of the computer, the current drive can be slid out of the frame and a new one inserted. Original generation MacBook Air models use a zero insertion force (ZIF) connector, so make sure the hard drive or solid state drive you use has this type of connector. Models manufactured after the summer of 2009 feature a more common Serial ATA (SATA) connector. All MacBook Air hard drives or solid state drives must be 1.8 inches wide by 5 mm tall to fit in the frame.
Reassemble MacBook Air. Place the bracket back in the computer and secure it using using the removed screws. Reattach the ribbon connectors for the accessory ports. Replace the back of the computer and secure it with its 10 screws. Boot the computer and install Mac OS X, being sure to test functionality.
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How to Restart From Apple Grey Screen

Attempt a basic restart. Press the 'Command,' 'Control' and 'Power' buttons simultaneously. Your computer should automatically restart unless completely frozen.
Hold down the 'Power' button for about 10 seconds to shut down the computer. Then press the 'Power' button again to start up the machine.
Disconnect any external devices and peripherals such as printers, scanners, external CD/DVD drives and other devices. Remove any Ethernet cables as well, and try restarting again. Sometimes a faulty peripheral will cause your startup to fail.
Shut down your computer again if you continue to see a gray screen on startup. This time, start up your computer again and immediately hold down the 'Shift' key to perform a safe boot. If your computer starts up successfully, try restarting to see if the safe boot resolved your problem.
Reset your paramater RAM and nonvolatile RAM. Shut down your computer, start it up again and immediately press and hold the 'Command,' 'Option,' 'P' and 'R' keys simultaneously. Make sure to press these keys before the gray screen appears. Release the keys when your computer starts up successfully.
Insert your Mac OS X installation disc into your CD/DVD drive and restart your computer. As soon as your computer screen begins the startup process, hold down the 'C' key on your keyboard to use your installation disc as a startup disc. When your computer starts up, select your 'Disk Utility' option and perform a basic repair. Restart your computer again.
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How to Fix a Computer Screen That Turned Grey

Look at the back of your monitor just below the socket for a voltage selector. Set the voltage appropriate to your country, if it isn't in the correct position already. For a monitor in USA, the voltage is 115 volts.
Check the display cable to make sure it is properly connected with the metal connector engulfing the display socket on the computer.
Disconnect the monitor's display cable and look at its pins. If any of them appear bent, straighten them out by disconnecting the power cable from your monitor and sticking a thin metal object next to the pin and levering the pin until it appears straight again.
Adjust the brightness and contrast knobs on the monitor. The settings may have been at minimum or maximum; adjusting the knobs will help return the settings back to an optimal position.
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How to Turn Off a MacBook Fan

Shut down your MacBook and disconnect the power supply.
Remove the battery from the bottom of your MacBook.
Press the power button and hold it for five seconds. Reconnect the power supply.
Press the power button again to boot up the MacBook and see if the fan issue has resolved.
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How to Connect My Sennheiser Bluetooth Headphones to My MacBook Pro

Open the cover located on the left earcup of the headphones. Connect one end of the charging cable to the socket installed in the earcup. Connect the remaining end of the cable to one of the USB ports located on the left side of the MacBook Pro. Allow the battery to charge for three hours before proceeding.
Disconnect the charging cable from the headphones and computer. Close the cover on the left earcup. Hold down the button installed in the center of the right earcup until the surrounding LED blinks red three times. Press the button again until the LED blinks blue and red in alternating order.
Click on the Bluetooth icon located on the left side of the computer's menu bar. Select the option labeled 'Set Up Bluetooth Device.' Select the headphones from the list of entries and follow the onscreen instructions; when prompted for a passcode, input '0000.'
Check the LED on the right earcup; if the LED is blue, a connection has been established. Repeat steps one through three if the LED is blinking red. Put the headphones on and play a piece of audio to confirm that the device is working.
Locate the two buttons installed near the bottom edge of the right earcup. Press the left button if you wish to toggle the Bluetooth connection on and off. Press the right button if you wish to activate the 'NoiseGard' feature. Press the buttons installed around the LED on the right earcup to adjust the playback volume.
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How to Remove the Battery From a MacBook (5 Steps)

Click on the Apple logo from the menu at the top of the MacBook screen, and then click 'Shut Down' to turn it off.
Disconnect all cables from the MacBook.
Turn the MacBook over and find the battery door latch.
Push down on the latch to release it and open the door. Remove the access door.
Grasp the battery tab and gently pull it up to remove the battery.
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How to Calibrate Your MacBook Battery (4 Steps)

Plug in your MacBook and give it a full charge. You can tell if your MacBook is fully charged when the green LED light on your power adapter changes from amber to green. When the LED is Green, your battery is at full charge. Leave the MacBook plugged in and charging for an extra two hours past the point when the LED turns Green.
Run your battery down and discharge it completely. Disconnect the power adapter and use your Mac until the battery is fully discharged. You will see a low battery warning on your screen, but keep using your MacBook until the battery completely runs out and the machine puts itself to sleep.
Close the laptop lid and let your Mac sleep, without power connected, for at least 5 hours. Letting your MacBook rest overnight is a good rule of thumb.
After letting the computer rest for 5 hours or longer, plug in your MacBook to the power supply and leave it connected until the computer is fully charged. It’s OK to use your MacBook while the battery charges. When the charge is completed, you’ve successfully completed recalibration of your MacBook battery.
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How to Connect My Belkin Router to the Internet

Unplug your high-speed modem from the power outlet and unplug the router if it is plugged in as well.
Disconnect the network cable that connects the modem to your computer. Plug this cable in from the high-speed modem to the Internet input port on the back of your Belkin input.
Plug your router in to the wall power outlet and wait for the lights on the front of the unit to stop flashing.
Plug your high-speed Internet modem into the power outlet and wait for the lights on the unit to stop flashing. Once both the router and modem are fully powered on, your Internet connection is successfully connected to your router.
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