Whether you’re upgrading or fixing a computer, a few basics apply no matter what. The No. 1 thing is to turn off your computer before you start tinkering with its parts. Check out these tips for any computer upgrade or repair:
Turn off and unplug your computer before taking off its cover. Please. This one’s the most important step before a computer upgrade or repair. You can damage both yourself and your computer if you forget to turn off and unplug the computer.
Install computer parts one at a time. Always make sure the first part works with your version of Windows before installing the next computer part.
The red (or colored) wire is positive. The red (or colored) wire often plugs into the pin or socket marked by a little + sign.
The positive/red wire connects to Pin 1. When you upgrade or repair to a computer part by swapping an old part for a new one, you may need to connect a wire to a pin. Look for little numbers printed along the edge of a socket. Can’t see the number 1? Then push the plug into the socket with the red wire facing toward the low numbers on the socket.
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Source:http://www.dummies.com/how-to/content/tips-for-any-computer-upgrade-or-repair.html
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