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No power to system

By JLCicchino ·
My thanks, in advance, for anyone who can help me.

I recently built a system with all new components. When finished, and plugged in/turned on, there was no power to the system (at all). No LEDs lit, no fans turning, no drives spinning, no beeps. . . nothing. I originally suspected a faulty power supply because even the power supply's fan wasn't working. Plus, I checked the wires from the supply with a voltmeter, and there was no voltage (power).
I installed my old power supply in the new system with the same results, no power. However, both power supplies work in my old system when attached to the motherboard via the ATX connector. As long as the 2 small wires from the power-on switch (case front) are attached to the motherboard, and the power supply ATX connecter is attached to the motherboard, the power supply will turn on. Apparently, the power switch on the case front sends a signal to the motherboard, through the ATX connector (wires), and tells the power supply to turn on.
I have tried the power switch wires in both possible +/- orientations on the "PW-ON" pins of the board. I even tried to check the power-on switch by briefly "shorting" the 2 pins labelled PW-ON with a screwdriver, but this did nothing. I have an AthlonXP1700 which runs at 1466MHz so my board settings are: 133MHz(clock) x 11(multiplier) = 1463MHz. The core voltage is set to "Auto" but I also tried 17.5V. The RAM voltage is set to 2.5V (default). There is 128MB PC2100 in bank 0/1.
I was meticulous in assembling the system, particularly with respect to grounding myself. There is no way there could have been static damage to the board. I've done this twice before with no problems.
If someone knows how I canget my motherboard (Epox:EP-8KHAL) to turn on the power supply, I would GREATLY appreciate it. Thanks.

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No power to system

by B_Pope In reply to No power to system

have you checked to make sure your wall outlet is working or your power bar if using one. plug a lamp into both to be sure.

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No power to system

by JLCicchino In reply to No power to system

Poster rated this answer

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No power to system

by JLCicchino In reply to No power to system

I checked to make sure the outlet was working. Both power supplies work in my old system, but neither in the new one. My IT department is 99% sure it's a bad motherboard (but not 100%). They said that if I shorted the PW-ON pins of the motherboard, then the board should have turned the power supply on.

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No power to system

by grbeckmeyer In reply to No power to system

I almost hate to answer this because it's embarrassing, but I had something similar happen on the first system I ever built, and it turned out to be my own (stupid) fault. I had mounted the motherboard directly to the pull-out motherboard tray in my case. I tried again using the standoffs and it booted right up.

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No power to system

by JLCicchino In reply to No power to system

It turns out the motherboard was bad. I ordered a replacement and it works fine. I will try to remove this post. Thanks for the reply anyway.

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No power to system

by zlitocook In reply to No power to system

1.Be sure the PWR on/off Switch is connected to the motherboard -check or replace switch
2.Be sure motherboard is not shorted to the case - try pull board out, isolate from case and test.
3.Be sure power supply is at least 300w, 2.03 compliant and functioning properly. - check and replace
4. The new motherboards require a special connector from the power supply. Make sure your power supply and motherboard are compatable.
5. The motherboard is defective.

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No power to system

by JLCicchino In reply to No power to system

It turns out the motherboard was bad. I ordered a replacement and it works fine. I will try to remove this post. Thanks for the reply anyway.

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No power to system

by bohicam1 In reply to No power to system

The new motherboards now have a jumper setting for a poweron keyboard function. Go back to your motherboard manual and find out where this jumper is and see how it has been set, you may just have to move the jumper over one pin....happened to me.
Good luck!

Mike

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No power to system

by JLCicchino In reply to No power to system

It turns out the motherboard was bad. I ordered a replacement and it works fine. I will try to remove this post. Thanks for the reply anyway.

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No power to system

by deltaB In reply to No power to system

acceptance to all observed safety precautions that would prevent damage physical/ESD. reject proper component install/testing. after any mobo install/replacement, ALWAYS test board integrity; perform “bare essentials boot” = processor + RAM (initially i use known good stick) + kybrd [optional, say some] i say not; keep in mind presence is checked by POST prior to video and some POST routines may halt. with this config, pwr up if all is well the first beep code indicates no video-turn system off at this point. you now know mobo is fit to build on. bad juju to install everything then attempt boot; difficult to isolate cause when 'no pwr/no POST'is problem. don’t see that this was done in question. i’d start over, break system down to do minimal boot as described. if still no pwr/no POST, possible causes other than mobo would be system battery or processor, which signals BIOS to begin POST. understand using new components, but burn in test may have been done prior to ship among host of probables. remove battery (leave out about half hour) to reset BIOS to factory default settings and try again. if still same, you could try another battery also processor but for nothing more than documenting. If mobo fails minimal boot, is reasonable to change pwr supply and RAM but other than RMA mobo.

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