ASUS Sabertooth X99 MOBO Problem! Need help!

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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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Hello friends and PC enthusiasts! I have had this Motherboard for almost 3 years now. It has run like a charm time and time again. Until.... it didn't.

https://i.imgur.com/sw6FLAo.jpg

STORY:

A few days ago I was playing Overwatch like any normal day with this same rig I've had for a couple years now. It was time for work and I shut down the computer (Start>>>>Shutdown) and left for work. Nothing seemed unusual at all, and didn't even think about it.

Next day I go downstairs to the PC to boot it up like I do almost everyday without any issues and WHAM!


ACTUAL PROBLEM: The Chassis, mobo, video card, and fans all light up and run for a split second and it shuts off immediately. No POST, no Boot (duh), no nothing... the only way to try to turn in on again is if:
A. Kill all power to the rig via PSU cable/ switch.

B. Unplug BOTH (tried swapping each cable/mix to no avail) EATX 12V CPU cables.

The PC will RUN without fail if I have BOTH cables unplugged, but no screen, no post, no nothing... just lights and fans forever....

On top of ALL of that this LED next to the CPU and RAM slots lights up and stays ON. (SEE PICTURE)
I looked in the manual for said board and it is NEVER mentioned nor circled... (nice job ASUS) The led is labeled on the board as, "PLED01"

THINGS I'VE TRIED BUT FAILED:

- Clear CMOS with jumpers
-Change Battery
-Breadboard
-NEW PSU
-Different GPU
-1 slot of RAM


It is VERY clear to me that it is either a MOTHERBOARD issue/death or a CPU issue. My best guess is the motherboard died but don't want to give up on her just yet. If I do get a new mobo, and it is the CPU problem, I don't want the new mobo to be fried.... Please help!

Rig
CPU: Intel Core i7 5820K 6cores

MOBO: ASUS Sabertooth X99 TUF

PSU: Sentey 1000W

GPU: ASUS Nvidia GTX RoG Strix 1080ti

RAM: Corsair 2133 8x4 32GB

OS: Windows 10 Pro 64-Bit

CASE: NZXT Phantom 820

EXTRAS ATTACHED: Corsair Water Cooler H100i
-----------------------------------------------------------------------------------------------------------------------------------------------------------
1/17/18
EDIT FIXED!!!!!!!!!

It was the motherboard! I got a brand new MSI board, plugged it all in with the EXACT same hardware from the ASUS board above (CPU,PSU etc.) and it turned right on, first power up. No issues whatsoever. Very pleased with MSI right now. Hopefully it lasts! :D Thanks for all of your help everyone!
 
Solution
jr9
- CPU or motherboard failure are likely causes as many others have been eliminated. Motherboard failure is far more likely of the two given the nature of the problem.

A problem with this type of problem with low level hardware is few people have a spare motherboard or a spare processor handy. When faced with a hardware malfunction in which no spare part available can be substituted, it may be better to pay a shop for a diagnostic to confirm which of the two it is rather than guessing, buying, and hoping. It would be a somewhat safe bet to buy another similar motherboard, but I woudn't be willing to put money on it as you would be.
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jr9

jr9

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- CPU or motherboard failure are likely causes as many others have been eliminated. Motherboard failure is far more likely of the two given the nature of the problem.

A problem with this type of problem with low level hardware is few people have a spare motherboard or a spare processor handy. When faced with a hardware malfunction in which no spare part available can be substituted, it may be better to pay a shop for a diagnostic to confirm which of the two it is rather than guessing, buying, and hoping. It would be a somewhat safe bet to buy another similar motherboard, but I woudn't be willing to put money on it as you would be.
 
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Solution
fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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Similar yes, but the only conclusion i can get is that either the MOBO or CPU is dead. Or both. I tried a different PSU that was a 550Watter, and it did the same thing. I am afraid to test my PSU on another PC bc it might fry it as well. I just really don't see how it could be the PSU, especially after i tried it with another (albeit much lower wattage) and still got the same results. :/
 
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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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THIS is what I have been thinking the whole time. I suppose she gave out on her last breath when I shut her down that fateful night. I think I am going to purchase a new MOBO, and put all of the same hardware in as before. I HIGHLY doubt it is my: PSU, RAM, GPU. That leaves me with the CPU and MOBO... and with it being more than likely NOT being the CPU, I will go with a new MOBO and post the results. Thank you all for your help.

I'll post results as soon as my new MOBO gets in.
 
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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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The GPU you are seeing that is dusty, is definitely not the GPU I said I had right? That's because it was an old (working) 1050 ti I was only using to get some sort of picture. And yes, with my PC being in the basement on the floor, dust tends to build up. I can assure you that heat is not the issue, as it is freezing cold in my basement and I have NEVER experienced temperature warnings, or any kind of emergency shutdown due to high temps. I will be cleaning the case and parts out thoroughly before placing my new MOBO in.

I have had this MOBO for 3 strong years. I am very certain she is dead. I would say that is an average life span of a MOBO that has done PLENTY of heavy gaming. Wouldn't you?
 
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jr9

jr9

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You've done very thorough troubleshooting so far and even went as far as bread-boarding to check for shorts. We both share the same conclusion on where the issue is. A few little things to do to make sure it is the CPU/motherboard as mistakes can be made in troubleshooting

CPU - Try reinstalling the CPU, paste, and heatsink.

Motherboard- CMOS clearing and breadboarding have already been tried. Not much else can be done.

RAM - Try the one stick in every slot, and they repeat with the other.

PSU - I would try to boot it without the 1080 Ti on the 550 watt or rather another card that is preferably lower wattage. If that doesn't work and you cant boot then that eliminates the PSU for 100% sure. Testing the current PSU with the system when it failed would be unhelpful.

GPU - Probably not the GPU. Try installing the non 1080 card into another PCIe slot. Sometimes slots just get flakey and with your CPU if there is no dedicated GPU the system will fail to boot.
 
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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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WONDERFUL tips and suggestions you have given me, I am very grateful. and yes, i have been "playing doctor" with this MOBO for a few days now to no avail, I cannot spring any life back into her lol.

CPU - I will try this with new paste and reinstalling the water cooler.

RAM - I will take multiple "one stickers" of RAM in each slot and try to get her on.

PSU - I forgot to mention but, I HAVE tried this with BOTH PSU's. In fact, I have never tried booting the 1080ti with the 550W. In the picture above you can see I have the MSI card in. That is the 550 ti GPU. I even put that MSI card into a NEVER before used 2nd PCIe slot. I can get everything to run (fans, lights etc.) but absolutely no picture on my monitor. and if I try this same exact setup WITH the 8 and/or 4 pin 12v CPU cable plugged in... WHAM! nothing but a quick fan spin and shut down. :/ I even took a multi meter and tested each slot, and cable voltage and they came out perfect at 12V's. the power cable is fine, which means (99.99%) for sure the PSU is working properly. :)

GPU - As just stated above, I have used an entirely never touched slot on my MOBO. both card spin just fine, lights and all. yet no picture... why? Simple, NO CPU POWER....NO PICTURE.

I'm almost considering getting a new (upgraded slot) CPU and MOBO (with correct slot type of course ;)) just to be 100% sure nothing can go wrong.

But as we said before... I think the CPU is fine. 3 year old MOBO seems to have shorted out/died.
 
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jr9

jr9

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I've seen non overclocked processors just die out of nowhere. Nowhere near as common as motherboard failure but it does happen. You have no way of knowing without trying the chip in another motherboard or getting a shop to do it.

It's not like this is a Athlon XP system, the 5820 is still very strong and worth fixing. The new top of the line (gaming department) 8700k is only 20% more powerful.

Power supply and video card are crossed off the list.

If you are getting a blank screen that means POST failed before or at video. It doesn't explicitly mean the CPU is to blame by any means. You will get this with things like bad motherboard, GPU not seated right, wrong CPU (8700 in a 7th gen motherboard for example). If you feel like doing even checklisting, there is a good thread if you are getting no video:

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems
 
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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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Let me explain exactly what is happening very simply: Assume absolutely everything is hooked up correctly, and it is like a completely setup PC, case cords, inputs and all.....

1. I press the power button, the fans spin for a split second, along with the lights on all components turn on for this duration. After that initial second of power, everything dies. the only lights or source of power seen are from the main power LED next to the chassis pins on the end of the MOBO, and lastly, the unknown "PLED1" LED to the upper right of the CPU socket, just before touching the RAM slots to the right of the board.

2. I unplug BOTH (or mix and match between the CPU 4-Pin/8-Pin) cables that lead directly to the PSU. ...And the PC turns on completely with all fans running, and lights on from all components. HOWEVER... No Video whatsoever. it is just stuck and can't do anything except "run" power through all of the components (minus the cpu).

What does this mean to you?
 
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jr9

jr9

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It sounds like a problem electrical in nature.

When a board shuts off in a second like that it's generally because something was so electrically wrong like a badly seated GPU that the board says "nope" and cuts power. I generally see this also with motherboards shorting on things. I've never seen a motherboard that would only fire up only when the P4 power connectors are disconnected. That actually makes me think it could be a CPU issue as that power connector is designed to feed the CPU power. If you start a board with no CPU it will run and do nothing but it shuts off when the CPU is given power? That is bizarre. I'd definitely avoid blind buying a motherboard. It could be the motherboard is failing to feed the CPU power or the CPU is just completely dead. I'd have a shop test both of them. I still think is more likely to be the motherboard but the CPU is now a bit more probable.
 
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fort.johnboy9000

fort.johnboy9000

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Jan 11, 2018
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To answer the points you have made:

I have used 2 GPU's including the 1080ti and even used a different PCIe slot. I press down and it clicks right it and latches firmly. I'm very positive that the GPU is seated properly. :)

YES! That is exactly what happens. I remove the CPU 4 pin or 8 pin Power connector and the PC will run, but no picture beeps or anything. But as soon as I plug power into the cpu via the 4/8 pin the PC immediately shuts off, or just doesn't start. I have tried plugging in the the cable with the PC running and i get a sound of an electrical short... and it shuts off.

I will look around and see if a PC shop can test my components for life, or death. We do have 3 working computers in my house and i wanted to try my parts with their mobo's and I was told to get the heck away from their PC's. xD

 
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