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ASUS Sabertooth 990FX R2.0 - CPU Red Light & Turn Off

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  • Sabertooth
  • Light
  • CPUs
  • AMD
  • Motherboards
  • Asus
  • Configuration
Last response: in CPUs
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April 17, 2014 7:59:00 PM

Hi,

I was wondering if anyone could help me with my problem.
Here is a description:
- When I turn on PSU, I see the motherboard standby green LED light up
- When I turn on the power for the computer, CPU light flashes red for the fraction of a second, all fans show very slight movement and then everything shuts off
- The motherboard green light stays on
- If I remove the CPU 8-pin connector and leave the motherboard 24 pin connector and then try turning on, all fan start and looks like the system is good to go
- If I plug in the 8-pin CPU power the problem repeats

Here are a few things I have already tried:
- Tried all steps with 0, 1, 2 RAM DIMMs in slot. Also with nearest and farthest slot.
- Tried all the steps with and without GPU
- Tried all the steps with 3 different working PSUs
- Reset by changing jumper from 1-2 to 2-3 and back
- Taken out motherboard battery and put them back in
- UEFI BIOS flashback with .CAP image from ASUS website
- Tried all steps without CPU in the socket

Here is my configuration:

- AMD FX 8350
- ASUS Sabertooth 990FX R2.0
- 2 x 8G DDR3
- NVIDIA GeForce GT610
- Corsair CX600

This is supposed to be a military grade motherboard and hence I want to believe that the motherboard is not fried. I am at my wits end and any help would be greatly appreciated!

Thank you!

Update: One thing I did forget to mention was that since about a week before it died completely, it would randomly reboot while in use.

More about : asus sabertooth 990fx cpu red light turn

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April 17, 2014 8:09:21 PM

What you are describing points to blown or bad VRM's/mosfets so I am afraid the board is gone. Why, it just happens to even quality products like you have.
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April 17, 2014 8:14:28 PM

rolli59 said:
What you are describing points to blown or bad VRM's/mosfets so I am afraid the board is gone. Why, it just happens to even quality products like you have.


It could be the board or it could be the PSU or even a short on the board.

Have you tried a different PSU to verify it isn't a PSU gone bad?

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April 17, 2014 8:15:02 PM

Rolli, thanks for your response. Are such issues normally covered under warranty? My motherboard in 8 months old.

Jimmy,
Here are a few things I have already tried:
- Tried all steps with 0, 1, 2 RAM DIMMs in slot. Also with nearest and farthest slot.
- Tried all the steps with and without GPU
- Tried all the steps with 3 different working PSUs
- Reset by changing jumper from 1-2 to 2-3 and back
- Taken out motherboard battery and put them back in
- UEFI BIOS flashback with .CAP image from ASUS website
- Tried all steps without CPU in the socket
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April 17, 2014 8:17:49 PM

It could be your poor power supply.
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April 17, 2014 8:18:03 PM

was this a brand new fx 8350
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April 17, 2014 8:18:56 PM

Well trying a different PSU would tell for sure! Yes issues like that are covered by warranty!
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April 17, 2014 8:24:17 PM

i used to have a msi 890fxa-gd65 and while trying to overclock a fx 8350 it shorted the motherboard and so the next day i went to microcenter and picked up a sabretooth 990fx r2.0 and popped in my chip only to experience a very similar situation that you are. If the psu does not fix it then im sure its the chip can you check the chip in another computer.
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April 17, 2014 8:24:22 PM

SR-71 Blackbird said:
It could be your poor power supply.


As said in the original post, I tried 3 different working power supplies.
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April 17, 2014 8:24:52 PM

coolcole01 said:
was this a brand new fx 8350


Yes cool.
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April 17, 2014 8:26:13 PM

its definitely the chip
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April 17, 2014 8:26:21 PM

From what you have done there are only two mother things besides the mobo that I would check. First I would check to make sure that the standoffs for the motherboard are only the 9 needed and that no others exist that could cause a short. A good way to verify this is to pull the mobo out and put it on a table (static free like wood would be best) and hook up the PSU, put in the CPU and one stick of RAM and if needed the GPU although you may be able to POST test it without the GPU as it will just stall at the GPU LED.

Second, check the CPU for bent pins and as well make sure no thermal paste got on the pins or in the socket.

If neither of these results in a successful POST then the board is for sure bad and it will be covered unless you spilt a liquid on it.
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April 17, 2014 8:26:23 PM

coolcole01 said:
i used to have a msi 890fxa-gd65 and while trying to overclock a fx 8350 it shorted the motherboard and so the next day i went to microcenter and picked up a sabretooth 990fx r2.0 and popped in my chip only to experience a very similar situation that you are. If the psu does not fix it then im sure its the chip can you check the chip in another computer.


Yeah I wish I could do that. If it were Intel, I could have tried that at work, no one I know uses an AMD supported motherboard.
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April 17, 2014 8:27:48 PM

coolcole01 said:
its definitely the chip


I would rule out everything else first. While I have run into a few bad CPUs (I did PC repair) I still ran into more bad mobos by FAR compared to bad CPUs (I would say a 10 to 1 ratio easily).
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April 17, 2014 8:27:55 PM

jimmysmitty said:
From what you have done there are only two mother things besides the mobo that I would check. First I would check to make sure that the standoffs for the motherboard are only the 9 needed and that no others exist that could cause a short. A good way to verify this is to pull the mobo out and put it on a table (static free like wood would be best) and hook up the PSU, put in the CPU and one stick of RAM and if needed the GPU although you may be able to POST test it without the GPU as it will just stall at the GPU LED.

Second, check the CPU for bent pins and as well make sure no thermal paste got on the pins or in the socket.

If neither of these results in a successful POST then the board is for sure bad and it will be covered unless you spilt a liquid on it.


Thanks Jimmy, I will try this before sending the board back.

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April 17, 2014 8:30:21 PM

noviceuser1234 said:
coolcole01 said:
was this a brand new fx 8350


Yes cool.


New CPU in older board? Why not put back the old CPU? That will tell if the CPU is at fault. If the CPU has been working in the board for 8 months then I belief it is like my original answer.
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April 17, 2014 8:32:00 PM

no other socket am3+ cpus lying around?
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April 17, 2014 8:32:00 PM

rolli59 said:
noviceuser1234 said:
coolcole01 said:
was this a brand new fx 8350


Yes cool.


New CPU in older board? Why not put back the old CPU? That will tell if the CPU is at fault.


I bought the CPU and the motherboard in July 2013. They were both new at the time and there is no reason one should be older or newer than the other.
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April 17, 2014 8:40:39 PM

noviceuser1234 said:
rolli59 said:
noviceuser1234 said:
coolcole01 said:
was this a brand new fx 8350


Yes cool.


New CPU in older board? Why not put back the old CPU? That will tell if the CPU is at fault.


I bought the CPU and the motherboard in July 2013. They were both new at the time and there is no reason one should be older or newer than the other.


So when it comes down to it if between the board and CPU in over 90% of the time it is the board, like a said what you described is bad or failed VRM's.
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April 17, 2014 8:43:17 PM

its true i have seen way more blown mobos than cpus heck i have blown up quite a few but only the one cpu but in this case its acting very similar so im sure its worth checking out.
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April 17, 2014 11:47:55 PM

Rule number 1:
CHECK THE CABLES

It may sound silly but it could also be a bad molex cable which e.g. powers a case fan.
I have seen this not even once where a bad cable or a bad connector are the reason that refuses the pc to boot.
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