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

1 Answer

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.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • 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.

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

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, ]

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,

,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.

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 )

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.


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? 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



6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 105 Answers

SOURCE: wont boot

i think the cpu may have a problem with the board or the memeory. either its bad, damaged or incompartible with your system. try out another cpu

Posted on Sep 29, 2009

  • 91 Answers

SOURCE: CPU overvolted and burn using 8pin eps12v cable on crosshair

no i dnt think so some time due to manufacturing defects this happens the new one wont burn unless and untill u over volt it.

Posted on Feb 03, 2010

  • 1447 Answers

SOURCE: GA-770TA-UD3 memory configuration error. I

You can use only 2 pcs Ram not 3 pics because you not mantain channel

Posted on Mar 17, 2010

  • 11800 Answers

SOURCE: Does a M2N68-AM Plus (Asus motherboard) have to

Yes, it will work, just that the fan control will be missing and the fan will run at full speed constantly.

Posted on Jun 22, 2010

  • 4737 Answers

SOURCE: No Display output from Motherboard

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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

New GA-990AX-UD3 motherboard will not boot

I have had a Gigabyte mobo not boot due to a pushed pin on the 24-pin mobo connector. I fixed and it booted normally. In your case it seems to be the video card. Are you using the DVI or HDMI output. Use the DVI first to setup your card on a monitor not a TV. HDMI is notorious for not working on a new build. Also reseat your video card and be sure non of the pins on the board itself are pushed in, or stuck in the out position it can happen. Also be sure your card is in the top slot or the 16X slot for the first boot. The one closest to the CPU. This may help. -Devin

Oct 25, 2012 | Gigabyte Computers & Internet

1 Answer


When you plug in the power cord is there any lightswhatsoever on the laptop, where the plug goes in or on the AC Adapter of thepower cord?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the laptop is trying to boot or may have booted, butthe screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous. Most times the problemis with the memory or Video Card. Count the Blinking Lights or Beeps and takenote of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button. And if that's true maybe you wasoperating off the battery the last time you had it on and since the power cordis bad, it was not charging the battery so the battery is drained and the powercord is bad.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.Maybe your DC Power Jack which is where the power cord plugsinto the computer is bad. Take an ink pen and push the tip inside thejack and see if the little pin wiggles, if so the jack is bad. You'll have totake the laptop apart to fix it. Most times it is soldered onto themotherboard, so you will have to desolder the old and solder a new one.Maybe your memory is bad or the memory slot is bad.Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.

Jun 05, 2012 | Gigabyte AMD Phenom II X4 960T...

1 Answer

I am having problems with booting my PC. When I turn it on, it does not boot the first time. I turn it off again and then it boots fine on the second attempt. Is this normal? Thanks for any advise. My...

no this is not normal

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((motherboard to your hard drive))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

May 01, 2011 | Gigabyte GA-890XA-UD3 Motherboard

1 Answer

I have installed a new mother board from gygabyte: GA-MA77OT-UD3 when i turn on the PC i hear 4 long beeps and than it restarts and goes all over again. need help.

On the motherboard, connect all power connectors,video(if you have intergrated video at this time I would just use that),cpu,cpu fan,one stick of ram. Nothing else, you can connect the front panel power-on button just to make it easier to turn on. When you have all the basics connected try to turn it on and see if BIOS comes up and the beeps go away. Do not connect HD,USB,or any thing else. If you get the same thing , swap the stick of ram with another stick. IF you get BIOS , one at a time start connecting other components and starting the system back up to make sure it boots normally. If still no chage, then it lies in your power supply , cpu, motherboard(although I know you said it's new they do at times come D.O.A).

Nov 16, 2010 | Intel Motherboard

1 Answer

GA-770TA-UD3 memory configuration error. I

You can use only 2 pcs Ram not 3 pics because you not mantain channel

Feb 18, 2010 | Intel Motherboard

1 Answer

My AMD x4 processor problem with gigabyte motheraboard

please load windows xp 64 bit . it will work well.
also check the temperature of motherboard and processor in bios
if temperature high use good heat sink and cpu fan .

Sep 19, 2009 | Intel PENTIUM-4 865GV CHIP MOTHER BOARD...

1 Answer

Wont boot

i think the cpu may have a problem with the board or the memeory. either its bad, damaged or incompartible with your system. try out another cpu

Mar 24, 2009 | Gigabyte GA-K8VT800 Motherboard

1 Answer

GA-7VRX Motherboard won't boot

Hi sebaswis, am I correct that this Gigabyte GA-7VRX is a replacement MB? (I read your other posted questions). You mentioned you put your old system back together & it worked fine. If mother board is shorted to the system case you will see the CPU fan spin for a second. Most motherboards use a green led which represents there is stand-by power running to the board.(This is normal). I am unsure why your led is orange. (Its not mentioned in your manual & manual does not show the led?s location). Was the other GA-7VRX MB led always orange or was it also green? Suggest you disassemble the heat-sink from the CPU. You mentioned you installed a new XP 2500+ CPU. If a pin on the CPU was bent during installation of CPU into the socket or if no thermal grease was applied or too little to the top of CPU, either would give you: CPU fan spins for a second & nothing else seems to run. Look over the link provided below. It is a guide to how to install a motherboard. (You may not need this but Its worth going over all the steps). As far as the power supply. If the MB's are the same (GA-7VRX) & the old system ran with 220W, the newer one should also function. Clarify these questions for me sebaswis. Mike

Dec 18, 2008 | Gigabyte GA-7VRX Motherboard

1 Answer

Ga-m61sme-s2l motherboard always shut down within 5mins

It sounds as if the motherboard is having a temperature safety shutdown. This occurs when the temperature of the CPU exceeds a certain limit.

First off: Please check your CPU fan, power supply fan, and graphics card fan(if you have a gfx card) that they are working. If not, I would highly recommend replacing the fans or at least cleaning them and attempting to get them started by rotating them manually.

Please enter your BIOS (See Here for instructions) and navigate to "PC Health Status" - check the entry for the CPU temperature. While in the BIOS there is little strain on the system, but if the temperature is above 40 degrees Celsius in this state it may be prudent to check the fan setting. Also, check if there is a CPU Fan fail warning/CPU warning temperature - on average the limit should not exceed 60-65 degrees Celsius, max. Set any Fan speed or mode settings to maximum if able.

Try again.

If problem persists, and you are sure the temperature is not too high and/or the CPU fan is working, it may be the power supply itself. It is possible for the power supply to shut itself off in extreme cases such as when a power supply's fan stops working, and the temperature of the power supply rises to an unsafe level. Sometimes the fan will work initially but quit after a certain time. The fan requires replacement if this is the case.

Let the computer sit for a while and check to make sure it is at or near room temperature. Attempt to restart the installation process. When the power is cut, feel where the power supply meets the case to check whether or not it is particularly hot.

Replacement of the power supply's fan should solve that problem. I recommend taking it to a repair shop.

If that is not the problem, a last resort is that the harddrive is overheating and causing a system crash. With the case open, start the computer (mindful to be careful and always touch a large metal object such as the computer case itself before getting your hands near any components to prevent static damage), and wait for it to crash. Place your hand gently on the harddrive. If it is very warm or hot to the touch, most likely the harddrive's actuator arm, circitry, or data plate is malfunctioning and the drive should either be taken to be repaired or replaced.

If none of the components in your computer are particularly hot, please come back with more information on your computer, such as the parts, what you are cd you are booting, any new hardware, etc.

Dec 16, 2008 | Intel Motherboard

Not finding what you are looking for?
Gigabyte Technology GA-990FXA-UD3- Gigabyte Motherboard Ga-990fxa-Ud3 Logo

523 people viewed this question

Ask a Question

Usually answered in minutes!

Top Gigabyte Technology Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18424 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

David Payne
David Payne

Level 3 Expert

14162 Answers

Are you a Gigabyte Technology Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides