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The tool you will need is a Philips screwdriver, preferably one with
a magnetized tip. A small flashlight is also useful.
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If your system is located under a desk, it's best to clear the desktop and
move the system to the desktop.
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Always be aware of static discharge! Touch the back of the power supply
to discharge yourself before opening the system.
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Once the system cover is removed, make a quick diagram of where each
component is, and the connection points of all the cables and wires.
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Check for obvious problems first: such as loose cards, cables, or wires, and
physically damaged components.
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Once you're finished, put every component back to its original position, and
reconnect all the cables and wires.
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Leave the cover off and power up your system to make sure it works; if
everything's fine, turn off the system and put the cover back on.
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