Hey, so the new Xbox Slim has a different power supply to the old ones, I have just got mine running with an ATX supply and figured I would post a tutorial/demonstration of how it is done for anyone who might want to.
It is very similar to the method used for the old xbox power supply, but I figured I would show it done to ease any confusion anyone might have over the different supplies.
First things first, get yourself an ATX power supply that has a high enough wattage to power the Xbox. The new PSU is only 135watt, as opposed the older Xbox's 203 watt supply. So any supply larger than 135W will do, I used a 450W supply as it was the only one I had lying around and I will be using the same supply to power some other things at the same time, but as I said for you just use any supply higher than 135.
The power supply MUST be able to supply over 10.83A on the 12V rails, and 1A+ on the 5VSB rail.
The new supply, as you may have noticed, has a different plug to the old one. That doesnt really matter, as we wont be touching the plug.
So once you have the ATX supply sorted, cut off your 360 power supply's cable, near to the brick. Make sure you cut the end that plugs into the Xbox, and so you should end up with a cable that plugs into the Xbox at one end and is cut at the other. Strip back the black plastic covering, and you should reveal 7 cables, looking like this.
The 2 yellow wires take 12 volts
The 2 black wires are grounds
The red wire is the 5VSB
The blue cable is used for the xbox to turn the power supply on from standby mode when you power it up.
The grey cable I am pretty sure sends a signal to the power supply to indicate when there is a problem, although I have not tested this and so I am not a hundred percent sure.
Basically just solder each yellow wire from the xbox cable to a corresponding yellow wire on the ATX supply, it doesnt really matter where you get them from I used 1 from the 24pin EATXPWR plug and 1 from the 4pin EATX12V plug.
Then solder each black wire from the xbox cable, to a corresponding black wire from the atx supply. I used two black cables from the 24pin EATXPWR plug.
Solder the red 5VSB wire from the xbox plug, to the 5VSB wire from the ATX supply. It is usually purple and connected to the 24pin EATXPWR plug but you may want to check the sticker on the atx supply just to be sure.
Ignore the blue and grey cables, I taped over them just so they wouldnt accidentally touch anything.
The soldering job should end up like this, after taping the wires up.
You should then end up with a cable looking like this:
Once this is done, plug the cable into the xbox, and turn the power supply on. Nothing will happen, as you need to bridge the green cable on the 24pin EATX power plug to a ground cable. Bridge pins 13 and 14 (green and black) on this pinout diagram to bring the PSU out of standby mode. (This pinout pic isnt mine I found it on another tut on se7ensins)
The reason I said to plug it in before bridging these two cables to turn the supply on, is that sometimes when you plug the plug into the xbox, a short is created for just a moment, which turns the ATX psu off. You then need to unbridge and rebridge the black and green cables to turn it on again. I assume this didnt matter when Microsoft were making it because if you were plugging an official supply in, it would be in standby mode as you plug it in, so the short would not affect it.
I bought a small switch to attach to the green and black wires so I had a button to turn the psu on and off, as mine is quite old and did not have an on/off switch on the actual supply. If you also do not have a switch on the atx case you could do this as well or just unplug the psu when you turn off the xbox, as the psu will stay on when turning the xbox off.
So at the end of all that, you should have an xbox slim powered by an ATX supply, like this:
Wiring Method To Power New Elite Xbox 360 With Atx Supply
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