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Sabertooth 990fx support for solid red CPU led dont kno wwhat to try next

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September 10, 2011 5:31:22 AM

HI all I just got the new sabertooth 990 fx and a new amd phenom 1100 six core black edition and 8 gbs new ripjaw ddr2 1600
and a radion 6850 GPU
with a rosewell 700 watt psu and a 500 gb 6gb sata hdd
and mt problem is when i go to turn it on and hold down the delete key is flashes words on the screen so fast i cant read more then ( please wait)
and then my monitor goes to sleep and the CPU led on the MOBO goes solid red.
Ive tried every configuration i can find on the web and it still does the same thing
( no post beep and a solid red CPU led )

Is my MOBO bad or my CPU?

Please help ive been without a computer for too long
December 20, 2011 5:59:23 PM

minifie said:
HI all I just got the new sabertooth 990 fx and a new amd phenom 1100 six core black edition and 8 gbs new ripjaw ddr2 1600
and a radion 6850 GPU
with a rosewell 700 watt psu and a 500 gb 6gb sata hdd
and mt problem is when i go to turn it on and hold down the delete key is flashes words on the screen so fast i cant read more then ( please wait)
and then my monitor goes to sleep and the CPU led on the MOBO goes solid red.
Ive tried every configuration i can find on the web and it still does the same thing
( no post beep and a solid red CPU led )

Is my MOBO bad or my CPU?

Please help ive been without a computer for too long




Very strange indeed.. I have just put together a Sabertooth 990fx with a Phenom 955 (quad core black) and got the same error. I got frustrated and went and bought an FX4100 and the LED went away.

It would seem the AM3 platform processors are giving this board a bit of trouble no?

I'm sorry I can't provide any further help, as it seems that I now can't get video using my RADEON 4890... but I suppose that's a topic for another thread...
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December 20, 2011 6:08:51 PM

I assume you meant DDR3 RAM?!

IF you are using an aftermarket HSF chances are it has Intel brackets so you'll need to use the AMD mounts AND IF that fails then use the OEM HSF. I also assume:
1. Thermal paste has been applied if the HSF didn't have 'pre-applied' paste.
2. 8-pin CPU power is connected to MOBO
3. 24-pin Main power is connected to MOBO
4. 2 x 6-Pin power is connected to GPU
5. All components are properly seated
6. Standoff's (all) are properly aligned to the MOBO i.e. no extras poking the MOBO aka shorting

IF all fails then breadboard:

You can try Lazyman's Breadboard -
* Disconnect ALL Front Panel & USB Headers ; keep only the PWR & Ground <best> short w/wire.
* Disconnect ALL peripherals including the Keyboard/Mouse
* (1) Stick of RAM in the second DIMM slot from CPU
* Unscrew both the MOBO and PCIe screws

Pull the MOBO away from anything conductive and supported by a towel ; short PWR & Ground to start.
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December 24, 2011 12:35:05 AM

I recently had a similar problem with the gaming system I build for my daughter using the Sabertooth with the 6 core AMD Phenom Black series CPU. The system worked great for 5 months then suddenly, no boot. Not even a POST. Got the RED CPU LED! Ended up shipping the CPU back to AMD to be replaced. After three weeks (CPU were not readily available) I installed, turned on and yes still had the same problem!! Looking at the manual for the Sabertooth MB again I tried resetting the RTC/BIOS settings using the jumper on the board! Success! it booted up fine. At least I thought I was good to go until the next day (today). I turned on the system only to have the red CPU LED on again. Using the jumper trick did not work this time. So I sent an e-mail to ASUS support. Given how close to X-mas it is I was not expecting any answer. In the mean time I tried to think of anything else I could check. The only thing left to try was the battery for the RTC/CMOS/BIOS settings. Since the MB was less than 6 months old I didn't expect anything strange but sure enough it measured only 0.3 - 0.5V, not the 3.0V it should be so off to Radio Shack to get a new CR2032 lithium battery. Back to the house, inserted the battery, put the system back together, powered on and YES! FINALLY it was working. I've powered cycled and unplugged the system several times so far today and this seems to have done the trick.

I never would have guessed. I'll be adding this to my standard check list for troubleshooting in the future!
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January 8, 2012 8:17:24 AM

bsyeagley said:
I recently had a similar problem with the gaming system I build for my daughter using the Sabertooth with the 6 core AMD Phenom Black series CPU. The system worked great for 5 months then suddenly, no boot. Not even a POST. Got the RED CPU LED! Ended up shipping the CPU back to AMD to be replaced. After three weeks (CPU were not readily available) I installed, turned on and yes still had the same problem!! Looking at the manual for the Sabertooth MB again I tried resetting the RTC/BIOS settings using the jumper on the board! Success! it booted up fine. At least I thought I was good to go until the next day (today). I turned on the system only to have the red CPU LED on again. Using the jumper trick did not work this time. So I sent an e-mail to ASUS support. Given how close to X-mas it is I was not expecting any answer. In the mean time I tried to think of anything else I could check. The only thing left to try was the battery for the RTC/CMOS/BIOS settings. Since the MB was less than 6 months old I didn't expect anything strange but sure enough it measured only 0.3 - 0.5V, not the 3.0V it should be so off to Radio Shack to get a new CR2032 lithium battery. Back to the house, inserted the battery, put the system back together, powered on and YES! FINALLY it was working. I've powered cycled and unplugged the system several times so far today and this seems to have done the trick.

I never would have guessed. I'll be adding this to my standard check list for troubleshooting in the future!


My problem is similar. I know its not the processor because I tried a brand new one and same problem. Can you tell me where the CR2032 lithium battery is? My board was only up and running for about a month before, well, you know. I'll go and try looking up the location but you can tell me anyway just in case :D 
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January 9, 2012 11:06:51 AM

Bleakmage said:
My problem is similar. I know its not the processor because I tried a brand new one and same problem. Can you tell me where the CR2032 lithium battery is? My board was only up and running for about a month before, well, you know. I'll go and try looking up the location but you can tell me anyway just in case :D 


The battery is the round silver disk located near the center of the board. In my system it was covered up by the graphics board so I had to temporarily remove the video card in order to get to the battery. You will need to be a little careful removing the battery. The is a small metal retaining clip holding the edge of the battery. I carefully used a small flat blade screw driver to ease the clip back from the edge of the battery until it popped free.
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January 10, 2012 2:04:42 AM

bsyeagley said:
The battery is the round silver disk located near the center of the board. In my system it was covered up by the graphics board so I had to temporarily remove the video card in order to get to the battery. You will need to be a little careful removing the battery. The is a small metal retaining clip holding the edge of the battery. I carefully used a small flat blade screw driver to ease the clip back from the edge of the battery until it popped free.


Hmn. Maybe I blew it loose or something when I blew air in there for the first time the other day. . .and if fiddlin' with it doesn't work, I will try replacing it before RMAing it. I will also let you know how it turns out. Thank you for the knowledge! :D 
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January 10, 2012 2:32:28 AM

So yeah, I'll be replacing that tomorrow. I hope that's it. If not, all I have to do is fill out a form and do some shipping. . .will update. . .
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