ATX Power Supply Help!

i have this power supply. is it an atx supply? because i want to turn it into a bench top power supply but i can only use an atx. it has a 20 pin connector. i heard that if its not an atx, it wont work for some of the ibles on here. thanks.

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Hi, I put 330ohm resistor and LED between green and black wire and put switch between gray and black wire to be able to switch the power supply from it's front side. I didn't put the LED between gray and black since it's current is too low for the LED. Is it ok or green and black should by directly shorted (without any additional resistance)? I don't have exactly +12, -12, +5, -5 but something like +11,1, -10,9, +5.11, -4.2 Is this ok or there is probably something wrong with my power supply / connection? Thanks guys.
I Forgot to mention that I put 10ohm 20W resistor between red and black wire as well.
tech-king8 years ago
okay. 1) this is an atx 2) to start it, MOMENTARILY connect the green to a black 3)for an led, you need to attach it to a five volt rail (red wire) 4) the resistor also goes between a red wire and a black one.
guyfrom7up8 years ago
JUST TO CLARIFY SOMETHING: you need a high power resistor in between 5volt and ground, for the power supply needs a load to work. I'm fairly sure you don't need a resistor for the on/off swith. You can use a normal resistor for the LED (something around 200 ohms?)
gschoppe8 years ago
that is an ATX...

take one of the 12v connectors, and run it through a LARGE resistor to a ground wire... (the 12v rail requires a load on it to stabilize the voltage on both the 12v and 5v connections in many PSU's) cut the 20 pin connector off, and connect a switch between the green wire and any black wire... that will allow you to get power without a motherboard involved...

this thread shows my final build in one of the comments... I used almost the exact same model (also a Gateway mini-ATX PSU)
NachoMahma8 years ago
. I'm no expert on PSUs, but since no one else has answered and you seem to be in a hurry:
. If you just need the 5 and 12 VDC, any computer PSU should work.
. This should tell you what you need to know. IIRC, the 20-pin connector is the same on all PSUs, but check the link (my memory ain't what it used to be).