Question about ASUS P4P800-X Pentium Motherboard

1 Answer

System don't startup

The led on the motherboard is flashing. the color of the led is green.
Power supply is tested; result good. Memory tested; good. All the devices disconnected; result none. Processor changed; result none.

Something the matter with the motherboard or someting else? I look for your answer.

Posted by on

  • grizano Mar 31, 2009

    can anyone help me???

    The led on the motherboard is flashing. the color of the led is green.


    Power supply is tested; result good. Memory tested; good. All the
    devices disconnected; result none. Processor changed;
    I have big problem!!!!!!i dont know what else have to do!!

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  • 224 Answers

Well you've narrowed it down quite much. Have you tried reseting the Bios?

Posted on Mar 02, 2009

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Replacing the bios battery was the correct thing to do. Answer me this. The Asus motherboard should have a green LED light lit (Standby power LED), when the system is turned off. Also keep the power cord for the power supply connected at all times. Though it is possible the replacment bios battery was all ready low on voltage or dead. When you're system is turned off the power supply continues to send 5volt DC to the motherboard which maintains the bios 3volt DC.
If the green LED is not lit than there is no power charging the bios battery and every time you boot the system the bios will have lost its settings. If the green LED is red in color, than the problem is within the standby switch built into the motherboard. The standby circuit can not be repaired. Double check all power connectors from the power supply to the motherboard. If everything has a good connection and you're bios settings continue to reset you should consider replacing the motherboard. At this point you have nothing to loose. Install the latest bios update,
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http://www.asus.com/product.aspx?P_ID=d2Gi3Hr6quXOk51C&content=download

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You'll need to check the voltage output of your current power supply. The ATXPWR1 connector. See page 2-29 in your manual.
You will need a volt meater to check the power out-put for each.
The link provided should help you test your power supply; http://www.compute-aid.com/atxspec.html
If you feel this is a bit too difficult you can swap out your current ATX power supply with another. The power supply for the Asus MB should support a minimal of 300Watts output. Its recommended to use a 350 to 400Watt PS. Please provide what LED light is flashing and what color it is. Also include any beeps you may hear during boot up of the system. (Long, short and repeating if any). You can send me an email at triptic12@yahoo.com

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