Question about Gigabyte Technology GA-990FXA-UD3- Gigabyte Motherboard Ga-990fxa-Ud3

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New GA-990AX-UD3 motherboard will not boot

I have install the above motherboard into the case and wired it up, but it will not boot, the CPU fan is running so I assume that their is juice going to the motherboard, the case lights-up, the lights on the keyboard light-up, all the cooling fan are running, but nothing on the monitor, it's blank. I wonder if my putting a 4 pin 12v connection to the boards 8 pin connection would make a difference????. I am baffled.

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  • Master
  • 5,660 Answers

You really should take that Power Supply, and use it on grandma's computer.

The 8-pin EPS +12 Volt power cable was brought out, to provide more power To the motherboard AND processor.

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

The 4-pin ATX +12 Volt power cable has TWO yellow wires.
Yellow wires are 12 Volt wires. (And two Black ground wires)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

The 8-pin EPS +12 Volt power cable has FOUR 12 Volt wires.

In the motherboard manual, does it say, "Yes Tom. Go ahead and use a 4-pin ATX +12 Volt power cable. We don't care. We just use an 8-pin EPS for fun."

[ This is an 8-pin PCI Express power cable. Completely different,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8 ]

The motherboard probably uses 150 Watts by itself.
No Ram Memory, no CPU, no fans, etc.

The CPU could use up to 125 Watts of power. Just depends on what AMD, socket AM3, processor you are using.

Now to graphics card's power;
The most Wattage a PCI-Express x16 slot can deliver is 75 Watts.

The most power a 6-pin PCI Express power cable can deliver is 75 Watts.
8-pin EPS +12 Volt power cable? 150 Watts.

When buying a Power Supply you should calculate all components needing power,

http://extreme.outervision.com/psucalculatorlite.jsp

,then buy a Power Supply that has AT LEAST 10 percent more power than needed. Easier on the Power Supply.
Also a computer will NOT use more power than it needs.

10,000 Watt power supply, (Exaggeration ), and the computer only needs about 100 Watts for surfing the internet?

Computer ONLY uses 100 Watts.

Due to the price, the above, and the availability, you should use a 500 Watt power supply at least.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899123&CatId=1079

http://www.amazon.com/StarTech-6in-Pin-Power-Adapter/dp/B002O21XHQ

Or use it on yours if it has enough Wattage.

Back in the day, the motherboard didn't need to supply that much power to components on it.
More powerful Processors, Ram Memory, and graphics cards, brought the power needed, up.

A 4-pin ATX +12 Volt power cable was added for the motherboard. Then 6-pin PCI Express power cable for graphics cards. Then the 8-pin PCI Express power cable for graphics cards. Lastly the 8-pin EPS +12 Volt power cable.

(Better make sure the Power Supply you have is good, if you wish to use the above power adapter cable. Nothing like having a Power Supply with a weak voltage power rail, and a new build, to pull your hair out on )

http://www.gigabyte.com/products/product-page.aspx?pid=3894#ov


Out of the motherboard manual Page 23,

"With the use of the power connector, the power supply can supply enough stable power to all the components on the motherboard. Before connecting the power connector, first make sure the power supply is turned off and all devices are properly installed. The power connector possesses a foolproof design.

Connect the power supply cable to the power connector in the correct orientation. The 12V power connector mainly supplies power to the CPU. If the 12V power connector is not connected, the computer will not start.

To meet expansion requirements, it is recommended that a power supply that can withstand high power consumption be used (500W or greater). If a power supply is used that does not provide the required power, the result can lead to an unstable or unbootable system."

For additional questions please post in a Comment.

Regards,
joecoolvette

Posted on Oct 26, 2012

  • 3 more comments 
  • joecoolvette
    joecoolvette Oct 27, 2012

    Also; The motherboard is mounted to a Support Plate. The Support Plate can be a separate plate, or sheet of molded metal, or is part of the computer case. Mounting of the motherboard is done with metal Standoff's, or plastic Spacers. IF, you are using the hexagon brass Standoff's, they MUST be matched to a mounting hole of the motherboard. IF, there is a Standoff NOT matched up with a motherboard mounting hole, there is a strong chance it could touch an exposed solder joint, and short circuit the motherboard. Sometimes you are lucky, and it doesn't fry stuff, (Short Circuit), the first time, or second time. Just makes it where hardware components do not get the power they need. Removing the 'extra' Standoff, and everything mounted correctly, everything works fine. No damage. SOMETIMES.

  • Thomas Jones Oct 30, 2012

    Thank you for your arrogant comments which have cost me 150 dollars for a new power supply, which has not worked it is still as dead as it was before your comments. But thank you for them anyway.

  • joecoolvette
    joecoolvette Oct 30, 2012

    A) Apologizes for the arrogant comment. (I believe there was only one at the beginning, I really didn't view it as 'arrogant', but do STRONGLY apologize if it was percieved in that manner) B) I posted a Power Supply that cost around $50, not $150, as an EXAMPLE. C) I also posted that you could use a power adapter cable, and try it, did I not?http://www.amazon.com/StarTech-6in-Pin-P... My questions are; A) Was the Power Supply too low in Wattage? (Actually it is Wattage, but the Amperage of the 12 Volt power rail/s is more of a concern) IF, the Power Supply was deemed to have at least the minimum Wattage, then -> I, would have tried using the power adapter cable. Perhaps this is my fault for not pointing that out more directly, and relying on you to see that. My bad.

  • joecoolvette
    joecoolvette Oct 30, 2012

    Believe it, or not Thomas Jones, my goal sir, is to help you, not waste your hard earned money, or your time. Starting to think now that the motherboard is bad.

  • Thomas Jones Oct 31, 2012

    Dear Mr Coolvette, I am builing my first PC I am finding it difficult, for I am not conversant with all the computer jargon, I was just looking for a little help from someone who obviously knows more than I do, all that one can do sir is try their best which I am trying to do, all your comments where gratefully recieved and I thank you. Best wishes. Tom

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To troubleshoot the display, you need to disassemble the system, means you have to open up the cabinet and check the components and connections inside the box. I hope you will be able to open up the box so that you will get the view of the inner portion.
First, you need to disconnect or uninstall everything from the motherboard except the Processor with HeatSink Fan and the Power Connector(s). Unplug the Front Panel connectors (the connectors which come out from the front part of the cabinet, connected to the motherboard). You need to be careful with the main Panel, i.e. the power switch, reset switch, hddled, power led. Before you unplug them, note down the connection sequence if you might forget it. Also take note of the power switch pins, you'll need to short it after a while. Unplug the HDD data and power cables, Cd/Dvd Drive's cables, and everything else. Remove the ram, remove the bios battery.


(don't remove/disconnect the system speaker)


Now, connect the power cord and the monitor on the back, power on the monitor (I would recommend you to connect the monitor via VGA), take a screw driver and short the power switch pin on the motherboard (I've mentioned this to you to take note). Look at the cpu fan and on the monitor, at least the system speaker should beep this time with the beep codes indicating that there's no Ram/Memory installed. (If nothing happens, then there's problem with the motherboard, could be the video card or could be the bios or something else) If so, then turn off and install one Ram. Again power up and check the status, if there's nothing wrong with the Ram, Motherboard, Bios or video Card, then you must see the Bios' System info screen (black screen with white texts after the Dell Logo flashes). If it doesn't seem anything happen, then try with the other/another ram. (If it fails, then there's problem on the motherboard, you better get another than repairing it.)


If it boots up with the Bios System info screen, then turn off and connect the front panel and other panels, like usb or audio etc.. Again power On the machine from the Power switch (this time On/Off switch), verify what happens. if it's ok, turn off and reconnect the hdd and the dvd drive and so on.... untill everything is reconnected and reinstalled or you'll stuck somewhere during the steps when the faulty component is installed.
Let me know the outcome, sorry, this is too long.....but I don't want you to get confused.


Please don't forget to mention the motherboard model and make with the system configuration, otherwise, it's not that easy to troubleshoot..
Till then good luck.

Posted on Nov 09, 2010

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