Lighting LED problem: Question re Power Supply

[Fat-Tug]

I'm new.

Also, I'm in the process of trying to wire some LED pushbuttons on my CP-- and pulling my hair out.

I've got a PC power supply.  I've snipped one of the peripheral connectors and tried to generate a light by connecting the red +5 volt and black ground to the tabs on the LED bayonet--  nothing.  I've tested it on a number of the pushbuttons.  Same result.

Is there something I'm doing in wrong?  (I'm sure there is.)  The LEDs are for Ultralux pushbuttons.  Five volts.

I'm confident that the supply works and the LEDs are in good shape and functional.

Unfortunately I don't have a multimeter, but I've got someone bringing me one tomorrow.  But I'd like to tackle the problem before then if I can.

[yotsuya]

Silly question, but is the power supply on? Meaning, is it all hooked up to a computer that's running and powered and you're doing it, or is the power supply just plugged into the wall and nothing else? You'll need to short some pins on the power supply hookup to turn it on if it's stand alone.

[Fat-Tug]

Not a silly question.  It's standing alone.  That must be my problem.

[ed12]

the green wire of the stand alone putter power supply
u tie to 1 of the black wire's
this is your power control for atx atx mini supply's

ed

[nitrogen_widget]

here is a nice little guide.
http://www.instructables.com/id/How-to-power-up-an-ATX-Power-Supply-without-a-PC/

[ed12]

here
Orange    +3.3 V    1    13    +3.3 V    Orange
+3.3 V sense    Brown
Orange    +3.3 V    2    14    −12 V    Blue
Black    Ground    3    15    Ground    Black
Red    +5 V    4    16    Power on    Green
Black    Ground    5    17    Ground    Black
Red    +5 V    6    18    Ground    Black
Black    Ground    7    19    Ground    Black
Grey    Power good    8    20    Reserved    N/C
Purple    +5 V standby    9    21    +5 V    Red
Yellow    +12 V    10    22    +5 V    Red
Yellow    +12 V    11    23    +5 V    Red
Orange    +3.3 V    12    24    Ground    Black

    Pins 8, and 16 (shaded) are control signals, not power:
        Power on is pulled up to +5 V by the PSU, and must be driven low to turn on the PSU.

ed

[Fat-Tug]

You guys are geniuses.  Working great after shorting the pins.  Thanks so much!

[frynturn]

I fell for this noob mistake too and was pleased when I saw you ask it as I knew the answer   Who would have thought a PSU would actually have to be plugged into a computer to work??