Step 2: Connect!

Now it's time for the wire.
Bend the wire and close up the little green plug from the big ATX plug to any other BLACK plug. Cause the black is the ground. To come off best you should connect the green with black besides the green.

Your PSU should power up immendiatly!
You are done!

2 Notes:

Use a thicker cabel for this. a standart one will cause a loose connection witch
isn't good for the PSU.

When you do this make sure that you have some device(s) connected to the PSU. Otherwise your PSU tries to drive the non-existing device an will overheat.

<p>Thank you so much! I thought my new PSU was DOA until I tried your trick and it fired right up. Of course, now I have to figure out what I did wrong somewhere else in my wiring. -_-</p>
<p>The motherboard in the computer might have a problem rather than the power supply. I had that happen one time and thought the power supply died. It was fine but the motherboard had died on me. Put a new one in and the power supply was great. Those power supplies have some kind of circuit in them to tell when they're connected to something and if that circuit goes bad, looks just like it died on you. I'm going to rig one of those to run my ham radio station :)</p>
<p>Needed more amps for charging my LiPo batteries than my lab PSU could deliver. So I tried my old PC PSU and now I can charge @ 3 A instead of 2 A.</p>
<p>wow so my old brain says add a switch use my old 300w power supply attach it to the hdd grinder and I have a portable grinder....awesome will post pictures when it is done</p>
You missed something...<br>Put a 5v led from the power OK to a black wire (I think) and it should start. If you are having trouble try that
<p>Great tutorial by the way. This seems to have worked for me, not having an on switch on the power supply, I could not start it. But your video helped. Lights are running off of it. Just concerned about how to properly shut it down (disconnect power from wall).</p>
<p>So, with no switch on my power supply, the shut down procedure would be:</p><p>1. Turn off connected devices.</p><p>2. Quickly unplug the power supply before the capacitors start to blow?</p><p>It occurred to me that it's probably pretty toasty in there and it would make sense to let the fan cool things off before pulling the plug. But I suddenly remembered what was said about the capacitors not having a load to determine..</p><p>Do I have this correct though?</p><p>The order on shutdown?</p><p>Just yank the plug?</p>
<p>Would this work for running extra devices in a pc, ie 3tb SATA drive?</p>
<p>Thanks, man! Straight forward and simple. </p>
<p>Hello. I bought a gadget recently so i could turn a 3.5&quot; sata hdd disk to usb disk. But i couldn't power the disk. I happened to see your page so i tried with an old psu that i wasn't using...I was dissapointed at first because the psu started for a moment and then it stopped. Couldn't read the disk. But then i remembered i had an old cheap desktop fan that could be powered by molex. So i connected both the fan and the 3.5&quot; hdd and......There it is. All now is working great. Thank you very much......</p>
<p>Hey FixedHDD I don't know if you're still answering to comments on this instructable, but I'm wondering, I have this PSU that seems to be the issue of why my pc is not working, however, I tested the voltage from the green wire and I do get 5v, but nothing happens when I short it, do you think it's fixable/worth it?</p>
<p>Wow! FixedHDD really created a classic here. Concise, easy to understand and with pictures that really help. Six years and over a quarter million views later and it is still helping people. And it did help me. Just what I wanted to know explained in clear English. Fixed HDD probably isn't even monitoring this any more but I send him (or her) my thanks from California. Also thanks to the German schools for teaching English so well.</p>
<p>Has anyone tried using a lighted rocker switch to control the power supply on lead instead of a regular switch?</p><p>The illuminated rocker switch has three leads- Power Ground ACCessory. </p>
Testing New strip led arrived!
<p>I used this to power a couple of PC fans to cool my entertainment center. I had an issue with my cable box and home theater receiver overheating. I could not keep the front doors open because I have a toddler running around that likes to push buttons on everything. This saved my equipment.</p>
<p>Do I plug in the ATX before or after installing the wire into the green and black sockets?</p>
Unless the part of the wire you are touching is insulated, or you wired up a switch, I'd plug it in AFTER you make the connection. The amperage probably isn't enough to cause too much harm if you shock yourself there, but I'd be better safe than sorry.
<p>Very useful tip! Thanks!</p>
<p>Thank you for your tutorial. I appreciated it very much. In a week or so, I'll be buying a PCIE to Thunderbolt enclosure and a graphics card for which I'll need a separate power supply. I'll be using a power supply from an old PC to power the graphics card because the enclosure only supplies 25 watts, which is probably why Intel approved it(25 watts isn't enough for a graphics card). I tried the power supply and it didn't work. Now that I've found(and read) your tutorial, I'll be able to make the power supply function so it'll power the graphics card.</p><p>Regarding your English, I agree with Gunterja, your English is very good, and I'm a very tough grader. To me, incorrect grammar and spelling is mentally painful. Aside from a few capitalization mistakes and one spelling mistake, your English spelling is also quite good, and is better than that of a significant number of Americans.</p>
<p>Vielen dank! Ihr englisch ist sehr gut. Ich verstand, kein problem. </p>
<p>Quite simple ... i hope it will work because i tried a similar way but i blow up something!</p>
<p>First few times I tried this I had some nice explosions (I suspect I blew a few capacitors). But running a couple fans for me now. (Presumably it would no longer work as a computer PSU now but it seems to do the trick) and as there are no more pops I presume i've got no capacitors left to blow now.</p>
<p>Thanks for this :)</p><p>At start I tried to use Power Good connection, that is shown on PSU - it didn't worked.</p>
<p>Nice job! Well done, and thanks, I was Google-ing this problem, and found your solution very helpful!.</p>
did that but make a weird noise and gives only 5v i need 12v now what?
<p>It needs a load to work correctly. Red wires are generally +5V, yellow wires are +12V.</p>
When I did this, mine briefly fires up and then shuts off on it's own. Any idea why?
<p>A belated reply, but the power supply needs to see a load to stay on. It's being clever, noticing that there's nothing for it to power, and shutting itself off.<br><br>Per the comment above, a 5 watt load on the 5 volt side will probably keep it on. You could use a power resistor of the appropriate size.</p>
The easiest thing to use to test a lot of devices that need a 'load' connected in order to operate, is a lightbulb. In this case, use 12volt automobile brake light bulbs, they don't cost much and they limit the current draw when they light up because the resistance of the filament increases.
Most may not power-up right off the bat.. they may power-on for 1/2 a second, then stop, if there is no load on the +5V.. this load can be 10-ohm,(10W) to 33-Ohm (5W).. Most ATA hard drives draw about 6-7W, dependent on the maker... (as long as nothing is connected to the IDE socket, powering up/down a hard drive will not delete data.) The switching circuitry will compensate on the load, maintaining the correct voltage. <br> <br>A test I do, make the short to the PWR-on to GND as you describe. Plug the supply in to the wall. The cooling fan will power-up, If it needs a load, the fan will just go on for 1/2 a second, then spin-down. Unplug the supply from the wall.. Within 2 seconds, as the filter caps bleed-down, the cooling fan will spin-up again for only 1/2 a second. This is the switching circuit simply noticing no use load, and simply shutting down. <br>
thanks amigo, I have an ATX power supply in English with labels for each color, and another what appears to be Japanese with no labels. The English ATX is just plug and use no questions asked, the other however i thought was scrap.You saved me from tearing it apart!
If you have a DELL PSU instead of an ATX, theres a grey wire in the corner and a black one right next to it, just short them out instead of a green one to get same results.
Thank you ! I appreciated this info. <br>Working on a cnc machine, have a dell psu I'm using as the power supply.
Thank you I needed this info
Great! Had forgotten this. Now to make use of my spare PSUs...
Glad you like this! You're welcome :)
cooler master rs 500, Why is this not working for me, the power supply was fine before i started this project. i jumped it once and it worked but now its not working for me...
They need a small load on at least one of their lines (12v/yellow, IIRC) or they cut out for safety reasons.
Your English is better than most Americans! Thanks for a great instructable!
what devices, how about hair dryer, can i connect it with hair dryer..
and i thought hair dryers are going to be plugged in to the outlet.... But anyway, you can connet everything that works with 12V, 5V or 3.3V.
alright. thank u.
my questions can i connect wire(green one) like in the picture with soldering iron , will it work, or i just gonna blow something.
Soldering will be fine...
sure you can. Does your PSU have a switch? Well then it is no problem at all.<br><br>After all my work in this instructable I ended up with a PSU having two switches. You can spare one if you solder the green to the black wire.
how about power, what im trying to say is soldering iron might received more or higher voltage, could this possibly happen.
I would like to know how to start ATX power supply without a PC with one button click and release (that the switch is not ON all the time like in this case, but only for a few moments when you press button - like when you press power button in PC when you want to start computer).. if you know what I mean.. tnx ;)
Well, to keep the PSU up and running the green and the black wire must be shorten permanently. A pulse switch doesn't work. <br><br>Buf if you are familiar with working with relays and stuff you could do this.
Nice work mate :)<br><br>I've been looking for a simple way of getting my PSU to work without a motherboard, and it doesn't get much simpler than this!<br><br>Thanks.

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