EMachines T5274 Desktop PC fan running full speed

SOURCE: Where do I plug in

When looking at the motherboard with the back of the computer to your left, there should be a row of pins on the lower right corner of the motheboard (or close to the corner). These pins are normally marked as something like PLED (for the power LED), PWR SW for power switch, RST for reset, IDE LED for the hard drive light, etc.
The power switch is normally along the bottom row and the power LED is on the top. But--to find where the power switch goes, take a small screwdriver and short two of the pins to see if the computer turns on. If it does, you've found the power switch. When the computer is running, put the power LED plug across two pins to see if the power light lights. If it doesn't, try two more until you find it.
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