Instructables
This Guide Will teach you How to start a computer PSU (power supply unit) with out need for a motherboard. you'll be able to power any component with no need to fiddle with switches and jumpers. and if you want to "leak test" a water cooling kit with out getting an expensive MOBO wet then this is really good. It couldn't be more simple.

you will need;

a PSU, - if you figured this one out, you have the brain cells to complete this instructable

Wire Strippers / side cutters or cigarette lighter, anything you can use to remove some of the plastic off the

some cheep electrial wire (can be ripped from Ethernet cable) i got mine fo £0.80 (just under $2) from rapid electronics

electrical tape

optionally you may want a soldering iron and some solder.

 
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danielemur4 years ago
What if you have a psu with out a switch?
F1X0R (author)  danielemur4 years ago
Um, I haven't seen that before really. Still I suppose you'd have to just use the wall socket in stead of the switch on the PSU.
tin7015 years ago
lol even though I already knew how to do this I still enjoyed it! great instructable. i laughed so hard when i read this: "you will create a nice blue spark and cry when you realise that the component is now dead."
F1X0R (author)  tin7015 years ago
Happened to me once, lucky it was only an old hard drive with nothing important saved on it. Had it of been anything else, I may have cried.
Happened to me too once, it was a 40GB Maxtor Fireball (7200RPM). And I did cry, lol.
 :(
12V5 years ago
12v is the yellow wire(or orange)!
F1X0R (author)  12V5 years ago
Sorry. I thought I corrected that little gaff ages ago.
clunkclunk6 years ago
Leek test?
leek.jpg
nah its to test if ur liquid cooling leaks anywhere not to test plants!
n0ukf6 years ago
The red wires are the 5v not 12v supply. 12v is on the yellow wires. Older AT supplies don't need this jumper, they just may need a load resistor as drcrash mentioned. and they always have a power switch of some kind.
F1X0R (author) 6 years ago
this instructable doesn't deal with converting the power supply to a bench tester. merely running it with out having to use a motherboard. so i fail to see your point. they may have some similarities. though it wasn't I that said anything about mimicking a load. this instructable just deals with how to make it start to use the molex adapters to test things like water cooling units hard drives etc with out need for a motherboard. this leads me to think you havn't actually read what is in the instructable.
gamer F1X0R6 years ago
he showed us how to turn on a psu without a motherboard, i needed this the other day, and it wasnt for a bench tester. this instructable is very instructive. -gamer
drcrash6 years ago
There are already several Instructables on how to convert an ATX computer power supply to a standalone power supply for whatever. (Including the part about using a resistor to make sure you present the minimum load so that the think works.)

http://www.instructables.com/id/ATX--%3e-Lab-Bench-Power-Supply-Conversion/

http://www.instructables.com/id/Yet-Another-ATX--Lab-Bench-Power-Supply-Conversion/

http://www.instructables.com/id/Convert-an-ATX-Power-Supply-Into-a-Regular-DC-Powe/
Many modern psu's need a load to turn on. A 10 watt, 10 ohm resistor from Radioshack between a red and black wire will work.
You'd be suprised how many you can jump start like this. I've only found one that needed a load, and it was an ancient AT style. I flipped the switch, and the fucker went up in smoke! I usually just use a bent paperclip to start up my test PSU.
F1X0R (author) 6 years ago
oops, lol guess thats what you get for doing this at 01:00 in the morning.
good instructable :-)
mikesty6 years ago
A paperclip works really well. I've always got one in my wallet, so I just whip it out, short green-to-black (any black), plug it in, and go. :) Good instructable.