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[SOLVED] Sabertooth X79 Stock Settings Misbehaving - No Video/No POST

post #1 of 7
Thread Starter 
Hey everyone,

I recently put together the following system:

4930K
Sabertooth X79
2x4GB Corsair 1600
Cooler Master V1000
780 Ti SLI
Current BIOS - Stock Settings + XMP

Before I get into any overclocking I want to make sure the system is stable. I ran a stress test yesterday for a few hours and everything seemed fine. Last night before i went to bed I fired up the stress test again to let it run while I slept.

This morning the system was still running and was apparently still at load from the sound of the H100i fans but there was no video signal. Nothing I could do would wake the screen so I ended up doing a hard reset. To my surprise there still was no video signal and the BOOT_DEVICE LED was lit. Interestingly, my fiance told me she noticed the screen was 'awake' this morning only a half hour or so before I went in to check on it.

I cleared the CMOS and then did all sorts of memory and video card swapping but it wasn't until a swapped in an ancient GT 240 that I was able to see the POST screen again. Once I got back into the BIOS I selected system defaults and found that for some reason the memory timing (not frequency or voltage) was still set to XMP values and not Auto as I would have expected from a CMOS clear.

Once I got into Windows I shut down and put the GTX 780's back in along with the sound card. Everything booted up wonderfully.

I've been doing a little reading and it seems that the BOOT_DEVICE LED was likely due to an 'offending' device plugged into one of the USB 3.0 rear ports. I do remember noticing somewhere along the way that my external HDD was still plugged into one of the rear USB 3.0 so I unplugged it. This likely happened when I went to connect the DVI cable to the GT 240.

I can't wrap my head around why a stress test could have triggered this chain of events. I've booted the computer numerous times and even played a little Arkham last night without an issue; all with the external HDD connected. What could have possibly changed to cause the HDD to prevent POST?
post #2 of 7
Quote:
Originally Posted by MNiceGuy View Post

I've been doing a little reading and it seems that the BOOT_DEVICE LED was likely due to an 'offending' device plugged into one of the USB 3.0 rear ports. I do remember noticing somewhere along the way that my external HDD was still plugged into one of the rear USB 3.0 so I unplugged it. This likely happened when I went to connect the DVI cable to the GT 240.
What likely happened? Last sentence doesn't make sence

I can't wrap my head around why a stress test could have triggered this chain of events

Have a look at Windows Event Viewer and see what happened during the testing.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
post #3 of 7
Thread Starter 
Sorry - I can see how that was confusing.

I think the cause of the problem was actually the external HDD being plugged into one of the ASMedia rear USB 3.0. I did unplug the external from one of those rear ports at some point during this morning's adventure. My guess is that it was while connecting the DVI cable to the GT 240 because that was the point I was able to POST and get into the BIOS.

I've been doing a little searching on the issue and I have found others with this board that have had the same problem. For them, the solution was removing a USB device from a rear USB port. Another person said he had been having sleep/wake problems but was able to resolve it by removing devices from the rear USB 3.0 ports. This would explain why my fiance noticed the screen was 'awake' this morning after being 'asleep' last night and left for hours. I've noticed other times that neither the computer or screen will sleep while other times it works just fine.

I am confident I'm on the right track but what I've having a hard time with is why did this happen now? Did it even have anything to do with the stress test? Did a USB port give out? Should the board be exchanged/RMA'ed?
post #4 of 7
Bios update?

Version 4502
Description SABERTOOTH X79 BIOS 4502
Enhance compatibility with some USB device.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
post #5 of 7
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Bios update?

Version 4502
Description SABERTOOTH X79 BIOS 4502
Enhance compatibility with some USB device.

That was the version my board shipped with. I did update it to 4608 which is listed to "improve system stability".

Is it possible the board somehow hard-locked the monitor into sleep mode? Does cutting the video signal during sleep happen on the driver level or the system/hardware level?
post #6 of 7
Quote:
Originally Posted by MNiceGuy View Post

Is it possible the board somehow hard-locked the monitor into sleep mode? Does cutting the video signal during sleep happen on the driver level or the system/hardware level?
No, there is no way to "hard lock" a monitor in sleep mode. Well, not exactly. If the video driver failed during the stress test the symptom would appear as a monitor locked in sleep mode, but it wouldn't be. It would just be a monitor running without a driver so windows wouldn't be able to rewrite the stuff displayed on the screen. Same effect, different causes.

Cutting the video signal can happen at either the driver level or the device level but the effect would be different. Locked screen vs black screen

Event Viewer will very likely tell you what happened. But, I'd bet a dime to a dollar it was a video driver failure.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
post #7 of 7
Thread Starter 
I am confident I've solved my little problem.

I removed my external HDD from the rear USB 3.0 ports and began testing again. Using Prime95 25.11 there were still signs of instability in the form of rounding errors on one core. I ever so slightly bumped the vCore and now I am able to run Prime95 without issue.
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