I have a defective Compaq presario 5000 power supply model no. HP-U250XCS3, it has a 24 pin main connector, which does not conform to the ATX power supply specification. I need to know the voltage associated with all the wires on the connector, so I can modify a standard 20 pin ATX power supply and use it to power up the computer.The color coding does not conform to the color coding of a Standard ATX power supply. Any help will be appreciated abeza

It's probably easier (& safer) to buy a convertor - if you're in the UK then Maplin do them for about £3, I'd guess Radio Shack in the US would do them as well. "I know that I'm mad - I've always been mad..."

Thanks Johnr for your reply, I am aware of the 24 pin to 20 pin converter. Since the HP-U250XC3 does not conform to the ATX power supply specification, in terms of wire color coding and wiring of the connector,the converter will not be applying the proper voltages to the main connector of the motherboard. I guess Compaq designed their system so you have to buy the power supply from them. I have a few new ATX power supplies and if I had information in terms of what the D.C. voltages and signals are on pins 1 through 24 of the HP-U250XC3, I would be able to modify my new ATX power supply and use it to power up the computer.

Here is complete information for converter/adapter generic atx 20 pin for Compaq Deskpro EN Series (24 pin)... Note: Still some bugs, but work fine. Ahh, I not speak english, but I understend your problem, because I haven similar trouble and little review to electronics diagrams, I found the next tips: (In natal languaje; Spanish) Conversion Avanzada: Con esto se hace casi compatible una fuente generica 20 pin atx con una fuente propietaria compaq PIII, se corta el pin 8 PWROK, (cable gris) y se ponen en corto el pin 2 (3.3V cable naranja) con los pines 21, 22,(estos pines son los del lado derecho del conector y quedarian sin conectar) pero haciendo el corto con el pin 1 o 2 (3.3V) con esto se detecta la RED, y el sensor (temperatura). En Bios seleccionar "After Power Loss" Always ON. Bugs: 1.-Se tiene que apagar desde el switch de la fuente porque windows no la apaga automaticamente. Conversion Basica: Cortar el pin 8 PWROK (cable gris). dejar 4 pines restantes sin conectar. En Bios seleccionar "After Power Loss" Always ON. Bugs: 1.- Se tiene que apagar desde el switch de la fuente porque windows no la apaga automaticamente. 2.- No se detecta la tarjeta de Red, Ni el Sensor de temperatura. This message is typed with: Compaq Deskpro EN 1GHz, 256KB, 133 MHz RAM 512, I used a Generic power supply since december 2004, and not problems with OS, Win XP, Knoppix, RedHat 8, run perfectly. Good luck!