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Picture of Yet Another ATX Power Supply Mod
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You've seen other ATX power supply mods here on instructables, but this is my version, a bit less refined but it looks nice and most importantly, it works.
 
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Step 1: Cut off those cursed Molex connectors!

Picture of Cut off those cursed Molex connectors!
Tools: Screwdrivers (phillips)
Drill
Wire Strippers
Needle nose pliers
Linemans Pliers
Electical tape / heat shrink
One LED of the desired color (and a 1/4 ohm resistor if you feel the need)
Scrap wire
Spray paint
Sandpaper

This took me around an hour to complete, a bit longer to document and mess with minor hiccups i encountered.

Well, for the most part if your working with an ATX power supply, it has a 20 pin motherboard connector on it, cut all of your wires about 1 foot long, the brown, gray, and purple wires arent necessary,and can be cut shorter, but do NOT cut the green wire, that will go to our switch.

Step 2: Connect all of the wires of the same color

Picture of Connect all of the wires of the same color
Separate and bundle all of your wires by color, excluding the green and one black wire (they will go to your on off switch). Cut a hole ( i used a dremel) and mount your switch (im not sure what it should be rated for, the switch i ended up using is a push button style, i salvaged from my broken Sega Dreamcast power supply, i would assume it is rated for 120 VAC). I thenI taped all of my wires together for a clean look, although if i had binding posts i would much rather use them than the wires setup i chose.

Step 3: LED mounting

Picture of LED mounting
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I then took my 3mm 3VDC LED and attached leads from the black and orange wires and fed them back into the case of the power supply, and soldered on my LED. I then hot glued the LED to a scrap piece of aluminum. This allows the LED to serve as both a Power on/off light, and as i later found out the capacitors inside of the power supply retain a charge and after being disconnected from the power source and the light will stay lit. (helpful to know if you need to open up your power supply case, because you should ALWAYS discharge capacitors by shorting them before doing any electrical work near them.)

Step 4: Crimping wires and adding Aligator Clips

Picture of Crimping wires and adding Aligator Clips
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Well, the title sums this up, the idea is to bundle all of your wires (i grouped 5 wires per crimp) and using the crimps i had, i created the necessary electrical connections and plan to later add alligator clips on the ends for convenience. I didnt in the pictures shown, it was an afterthought i had, and it works very well.

Step 5: Finish!

Picture of Finish!
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You should now have a working, on off switchable power supply, (with an on indicator LED), and a clean 3, 5, and 12 volt DC power supply, enjoy modding. (paint if desired, i painted 2 sides and used sandpaper for a brushed aluminum look on the top side.)
russ_hensel6 months ago

Just a note to let you know I have added this instructable to the collection:
Encyclopedia of ATX to Bench Power Supply Conversion
>> http://www.instructables.com/id/Encyclopedia-of-ATX-to-Bench-Power-Supply-Conversi/
Take a look at about 70 different approaches to this project.

done mine. here's some pics.
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those few pics looks better than all in whole article! 
gamer7 years ago
1/4 ohm resistor? nice project! -gamer
1/4 ohm resistor means ,25 percent tolerence of going over the resistor's resisting voltage
1/4 ohm resistor, you've got something wrong... That would be 1/4 watt, wouldn't it be? -gamer
dagenius gamer5 years ago
no, he's talking about 25%. watt is not tolerence.
N1CK4ND06 years ago
Very nice, unless your power supply already has a built in power switch built in lol :p
Mr. Rig It7 years ago
Frank, Please allow me to constructively criticize you instructable. First the negatives 1.You have a nice idea here but the title is misleading. 2 You don't tell what the idea/thesis of the project is. It is only a couple steps later that this is identified and a power switch modification to an ATX case. 3. Proper capitalization of the word I (instead of i) would help. 4. Pictures could be a little better, but some pictures are better than none. Now the positives 1. Pretty good documentation of how you did it. 2. Cool idea. 3. Gives you the opportunity to use this same power supply in other Instructables 4. Nice work cleaning up and bundling all of the wires. The project came out nice. Thank you for not taking my observations personally. Good luck and keep'em coming.
good idea! :-)