Gigabyte EP45-UD3r help

hi good day..
my computer had been running for 3 hour without interruption. This
morning I shut it down, using the Shutdown feature of Windows 7. It
turned off as expected.

But when I pushed the on button on the front of the case to turn it
back on, nothing happened.

I did some checking. My multimeter indicates the on button works, and
the lead to the motherboard power switch pins is correctly attached. I
checked the green wire running to the motherboard from the power
supply, and it shows 3.7 volts. But when I click the on button, the
voltage does not drop! (The on button is supposed to drop this voltage
to below a volt, signalling the power supply to turn on.)

For fun I shorted the green wire to ground, and the power supply turns
on and things start to happen. But when I remove the short the power
supply turns off immediately.

However, if after shorting the green wire as described above I then hit
the on button again, the computer starts up normally, and continues to
run OK. help please what is burn r bad on my EP454-UD3r
3 answers Last reply
More about gigabyte ep45 ud3r help
  1. Hiya,

    Please provide a full parts list when asking for help. Obviously a MB model and PSU model would help us a lot here. Case too.

    Your motherboard sends the power_on signal. It then waits for a power_good signal from the PSU before beginning the POST. The Green wire only tells the PSU to come on, it does not tell the MB to POST.

    Without more info I strongly suspect a cheap/poor PSU.
  2. hi Proximon here is the parts.

    Motherboard gigabyte EP-45UD3R
    momery 2 gkill 1g each
    powersupply 550watt
    video card nvidia 9400 GT
    went i start the pc with the green and black wire i get a post and the pc work ok. but i can not change my bois setting do u think my bois is corrupt ?


    Proximon said:
    Hiya,

    Please provide a full parts list when asking for help. Obviously a MB model and PSU model would help us a lot here. Case too.

    Your motherboard sends the power_on signal. It then waits for a power_good signal from the PSU before beginning the POST. The Green wire only tells the PSU to come on, it does not tell the MB to POST.

    Without more info I strongly suspect a cheap/poor PSU.
  3. I think if the PC is actually successfully completing a POST the issue is probably not the BIOS.

    Have a look here:
    http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems

    Then follow the breadboarding advice.
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