In one sentence, describe what the following article is about: Match the wires of the car's harnesses to the new stereo's harnesses. Each harness connector is unique, so it should be easy to figure out which ones fit together. To be safe, check the wiring diagrams for both your car and the new stereo to verify you've connected them correctly. If your car's stereo doesn't use wire harnesses, you'll need to match up each wire manually. The wires are color-coded; however, the wires on an after-market stereo may not match with the color-coded wires in your vehicle. It's best to study and follow the wiring diagram that came with the stereo. Connect the matched wires. There are two options for connecting the wires, crimping or soldering. Crimping is faster and easier, but soldering will provide a more stable and secure connection. Be sure to use the proper size crimper and don't try to bundle the wires with tape it will eventually dry out and fall off. Bundle wires using zip ties instead. If your new stereo came with a separate mounting kit, assemble it according to the stereo's instructions (it will often mean fitting a metal housing sleeve into the mounting frame). Push down on the tabs located around the metal sleeve with a screwdriver to secure the metal sleeve in place. Typically, if you have a wiring harness, this connection will be made when you connect the new stereo harnesses to the harnesses in the car. If you aren't using a wiring harnesses, you'll need to manually connect the power. Determine whether your car has a switched power source (typically a red wire) or a constant power source (typically a yellow wire). Some vehicles even have both types of power sources. For more information on switched versus constant power, go here. If you're using wiring harnesses, this connection will be made when you connect the harness pieces. If you aren't using a wiring harness, you'll need to locate the bolt, wire, or screw that connects with the car's bare metal chassis. Loosen the bolt, wire, or screw and slip the stereo's ground wire (usually black) underneath, then tighten. Note that the ground connection is important to the optimal performance of the stereo. If the ground wire doesn't connect to the bare metal, it won't work. And if the ground wire connection is loose, it could result in poor audio output. Sand down the area with sand paper to ensure a good connection. Plug in the antenna cable and connect the stereo's wiring adapter to the the car's wire harness. Connect the output converter if one is needed to make the new stereo compatible with the car's audio system. Have in mind that all wires should be connected in the end and there should no single one hanging unattended. Turn the power on and test the AM, FM, and CD components. Test the fade and balance settings to be sure the speakers are working properly. Turn the power back off.
Summary: Match up the wires. Assemble the mounting kit. Connect the power source. Ground the stereo. Connect the remaining wires. Test the stereo.

Problem: Article: NVRAMshort for "Non-Volatile Random-Access Memory"stores settings like speaker volume, the default display, and other settings that your Mac typically uses. Resetting the NVRAM can fix problems wherein your MacBook Pro isn't playing sound, the display is flickering or turning itself off, the computer is taking too long to start up, and similar problems. On some Macs, "NVRAM" is replaced with "PRAM" ("Parameter Random-Access Memory"), which is fundamentally similar to NVRAM. Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear. It's at the bottom of the Apple menu. Doing so prompts your MacBook Pro to shut down. To reset NVRAM, you'll have to hold down the Command, Option, P, and R keys all at the same time for about 15 seconds. Press the "Power" {"smallUrl":"https:\/\/www.wikihow.com\/images\/5\/5d\/Windowspower.png","bigUrl":"\/images\/thumb\/5\/5d\/Windowspower.png\/30px-Windowspower.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of a Windows icon.
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Public_domain">Public Domain<\/a><br>
<\/p><\/div>"} button on your Mac to prompt your Mac to begin turning back on. Do this immediately after pressing your Mac's "Power" button; you'll need to be pressing all four keys at once before the Apple logo appears. If the Apple logo appears before you press the keys, you'll have to shut down and try again. Your Mac may reboot itself during this process. Once you arrive at the user selection screen, you can release the keys and sign into your MacBook Pro like you usually do. You may need to reset some of your preferences (e.g., preferred audio output) after resetting the NVRAM. If you are still having issues with the system settings, you may need to factory reset your MacBook Pro. You will lose any data that you have saved on the MacBook if you do so.
Summary:
Understand what resetting NVRAM will fix. Open the Apple menu . Click Shut Down. Click Shut Down when prompted. Find the NVRAM reset keys. Turn back on your Mac. Press and hold the NVRAM reset keys. Continue holding the keys until your Mac finishes starting up. Verify that the problem has been resolved.