Force Computer to Power On

I'm trying to fix a piece of equipment which has a PC inside of it, and I need to fix the PC so that it starts when the main machine is turned on (the pc power supply is fed from the machine, so when the main unit power comes on, the PC power will come on).

I've tried the "Power on after power failure" option in the BIOS, but it does not help.

Is there an add-on card, or pc-mod that I can use to make this work?

Thanks in advance!
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Jon JaquesInformation TechnologistAsked:
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willcompCommented:
Connecting wire for pin 14 (20 pin ATX) or pin 16 (24 pin ATX) to ground should do what you wish. PC will always be on when power is applied. I haven't tried this, so you may want to wait and see if anyone has before closing question.

20 pin pinout --->  http://pinouts.ru/Power/atxpower_pinout.shtml
24 pin pinout --->  http://pinouts.ru/Power/atx_v2_pinout.shtml
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nobusbiljart fanCommented:
i have tried it, to feed a pump, and it works without problems !
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Jon JaquesInformation TechnologistAuthor Commented:
Hello, thanks for the reply!

Does this still allow the computer to power itself off? Or, will it immediately start itself back up again?

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willcompCommented:
Windows (or other OS) will not be able to power off computer. You are bypassing that capability. PC will always be on when power is applied to power supply. Windows will still shutdown gracefully, just won't turn off PC. The on/off switch is bypassed as well.
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Jon JaquesInformation TechnologistAuthor Commented:
Hahahaha, well it turns out that the bios modifications DO work on this system, customer was just not pressing F10 to save changes! Arrrrrghghghghg!
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willcompCommented:
That's the more elegant solution.
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