You can definitely run it off a computer power supply, that's how I do all of my upgrades (easier than running out to the car). Take an old power supply, cut off all of the orange and red wires (they're 3V and 5V, no use for them now), and solder all of the yellow (12V) wires together and black (ground) wires together. There is also a thin green wire in the middle of the connector that needs to be grounded, as this is what turns the power supply on and off. There you have it... a 12V power supply that'll easily drive anything you need it for.