Computer Hardware
On PC power supplies, the wire attached to pin one is usually:

blue or red
red or black
blue or white
red or white
white or orange

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Computer Hardware
When connecting a ribbon cable to a connector, how do you know which direction to plug it in?

It does not matter
The blue or red line in the cable goes away from the power connector
The red line in the cable goes to the highest pin number
The colored line in the cable goes to pin #1

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