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Hopefully your doing this with a spare PSU, because a 200 watt drain might exceed your systems limit.
Your computer's PSU will put out 12, 5 and a couple other voltages of DC power. I'm pretty sure that a cars electrical system runs 12V, so thats what you want to use. Any yellow wire coming out of your PSU puts out 12V, red wires are 5V, and I forget what the orange/brown ones are. Just take what you need, and ground it with any black wire.
If you are using a spare PSU, take the big ATX connector, locate the green wire, and connect it to any black ground to use a a power switch (green is the power-on). You can insert a switch in there, or just use the one on the back of the PSU to turn the amp on/off.
Hope that helps a little.
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