No boot with all cores enabled :(

shonik09

shonik09

shonik09

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Joined
23 Jun 2016
Posts
156
No boot with all cores enabled?
Hi guys,

So I'm a bit demoralised at the moment... after a three week long project, I finally finished my watercooling loop with hardline tubing. I leak tested the PC for over a day, in addition to a few hours of testing with the PC on and stressed to ensure no leaks would emerge when the coolant heated up. No leaks so that was all good.

PC was running amazingly, hitting mid 40s (GPU+CPU) under load. While testing BF1, windows decides to reset and install some updates. While updating I walk away from the PC to make dinner, I come back and now the PC won't boot...

Basically it gets stuck when trying to load windows. After the option the boot to BIOS, the screen displays he ASUS logo but hangs, and I get either code Ad or F6. I swap out the RAM, turn off XMP, CMOS reset, qcode Ad. I tried booting from a windows boot disk, even when removing my m.2 so only left with my SATA, same error. Linux boot disk - qcode Ad. Then I try memtest, and the boot failed when testing multiprocessing, so I go back to BIOS and disable HT, and all but one CPU core, and BAM, memtest boots, and windows boots...

Right now I am tearing my hair out trying to figure out why nothing will boot when any more than one core is active. Thing is, it doesn't matter which core is active, as long as it is only one, which leads me to think it may not be the CPU...

I am going to try completely wiping BIOS, updating BIOS, and then reseating the CPU. Does anyone have any advice on what could be causing this?

I just don't understand how this has happened when none of the cores on the CPU were going above 45, the mosfets are cooled by the same block and they looked good too... how can a windows update cause such a ridiculous boot issue?

P.S system specs:

Asus deluxe II
i7 6850k running STOCK
64GB Trident Z 3200MhZ 14-14-14-16
Samsung 950 pro 512GB
Titan X Pascal
Corsair 1000RMi

Water cooling:
EK Asus x99 monoblock
EK Titan XP full block + backplate
EK XE 360 + 3 x 3000RPM EK vardar push intake
Black ice nemesis 240 GTS + 2 x 3000 RPM EK Caesar pull exhaust
EK XRES 140 PWM D5
 
If its failing in memory test on multi processing then that would indicate to be a hardware issue?

I think it might be purely coincidence that it was the windows update being applied.

Only other test if get a separate HDD and try to reinstall windows to well and truly rule out it been a os issue?
 
Ah so it doesn't even boot to memtest. What I meant is it stalls when checking multiprocessing capability....

I'm pretty sure it isn't OS tbh, as I can't even boot to the windows boot CD with all cores enabled. I think it must be something in BIOS or HW...

Is it possible this could be a bent CPU pin, even though it was working perfectly for 12+hours?
 
obviously check all the cpu pins first.
had this on a skylake cpu a few months back. only found out after replacing the mobo and ram it was the cpu at fault.
would only boot with one core active.
 
Right so I reseated the CPU and reapplied thermal paste and now my computer works like normal again... Great temps again too... Could this have been an issue with thermal paste application? Pins on the mobo were fine...

I'm using thermal grizzly kryonaut, and this time spread it like they recommend, hopefully that'll fix it long term, as I've found the kryonaut has a habit of being squeezed to the edges of the block when you just use X or pea methods...
 
Well, applying thermal paste is also very much like making love to a beautiful woman. Clean all the relevant surfaces, lay her out on the table, and cover her with paste. Then you clean up, light your pipe, stand back and admire your handiwork.
 
Legend said:
Well, applying thermal paste is also very much like making love to a beautiful woman. Clean all the relevant surfaces, lay her out on the table, and cover her with paste. Then you clean up, light your pipe, stand back and admire your handiwork.
Click to expand...

So much lol ....

Excellent Legend :)
 
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