How to Sync Mac Laptop to Mac Desktop (5 Steps)

Connect the power port on the MagSafe connector into the power connection on the MacBook. This allows you to charge the laptop while it is connected to the desktop display.
Insert the USB cable, also running out of the MagSafe cable, into one of the USB ports on the side of the Macbook.
Connect the mini DVI cable (also part of the MagSafe connector) into the mini DVI connection port, located on the left side of the MacBook computer.
Insert the opposite end of the MagSafe cable (a single USB cable) into one of the self-powered USB ports, located on the rear of the Mac desktop display.
Power on the MacBook and the desktop display. The content of the laptop now syncs with the desktop.
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How to Fix a MagSafe Power Adapter (4 Steps)

Make sure the power outlet you plug your power adaptor into is working properly. Test the power outlet by plugging an appliance that you know works, such as a lamp or a television, into it.
It is normal for the power adapter to heat up a little during use. Disconnect your adapter and let it cool off if it overheats. The adapter should function correctly after it has cooled.
Your MagSafe adapter may malfunction due to the pins located in the connector getting stuck. For example, all of the pins may get stuck in a downward position. When a pin gets stuck, unplug the power adapter from the power port and plug it back in. This makes the pins shift and set themselves again into a neutral position. If you are having trouble getting the pins to reset themselves, press them gently sideways with a non-abrasive object such as your finger.
Check the power port on your Apple computer and the adapter connector on your MagSafe for any damage, and clean them both. Clean the computer port or the power adapter plug by taking the adapter out of the outlet or by taking the battery out of the computer. Clean the connectors carefully using small, precise tools, such as a cotton swab or a toothbrush with soft bristles. Ensure no cotton fibers stick to the pins. Use rubbing alcohol if you want to clean the connectors thoroughly. Ensure that all connectors are completely dry before using your adapter or computer.
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My MacBook Won't Power On

Turn your computer off and disconnect any devices connecting to your computer, including a printer and your mouse. Keep the computer off for several minutes, then try turning it on again.
Check the battery level to your computer. On the side of your MacBook will be a tiny, circle button. Press the button in to test the battery. If all, or a couple, of the tiny lights glow green it does have battery life. However, if one light is blinking it needs to be charged.
Check out your MagSafe port and the battery adapter. Because the MacBook's battery port is magnetic, something could have gotten stuck inside of the port. Make sure the inside of the port is cleaned and cleared of debris. Take a look at the adapter, as well. Make sure the prongs, or pins, are not missing or broken. A broken adapter or dirty port will not be able to charge your MacBook properly.
Restart the computer by pressing Control, Command and the Power Button all at the same time. Hold all three buttons down for three seconds.
Schedule your MacBook for a service appointment with an Apple retailer or electronic/computer specialist if none of the above troubleshooting techniques do not work.
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How to Test a MagSafe DC

Turn the laptop on. Let the desktop appear on the screen. Shut down the laptop once the battery icon in the upper right corner of the screen states that there is less than 50% power remaining.
Rotate the laptop counterclockwise so that you can see the MagSafe DC-input depression at the upper left inside edge.
Plug the power cord attached to the MagSafe’s power supply into a wall outlet. Place the MagSafe connector up against the depression. Let go once you feel the magnetic attraction that is holding the MagSafe connector against the depression.
Turn the laptop on. Do nothing until the laptop’s operating system brings up the desktop. Note that the icon of the battery in the upper right corner of the screen is displaying a “lightning” slash through the battery icon. Write down the percentage of battery power being displayed.
Leave the laptop undisturbed for an hour. Note whether the percentage of the battery power has increased or not. If there is no increase in the percentage, the laptop’s DC-input board is not receiving any electricity from the MagSafe connector. If the percentage has increased, the opposite is true.
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