Rampage V Extreme/U3.1 Cold Boot Problems

[Tw1sted]

Hi All

I am currently at my wits end with my PC Build its been ongoing since March and still going and I have spent a small fortune on this build which I was so excited about at the time when I posted in the build advise section in Jan I think it was. Anyway Il start with System Specs.

System Specs are as follows:>
>Corsair Graphite 780T White Full Tower Case
Seasonic 1050W 80 Plus Platinum Power Supply + White CableMod Set.
Rampage V Extreme/U3.1 (Previously Asus X99 Deluxe)
Intel Core i7 5930K
Fractal Kelvin S36 Cooler
ASUS GeForce GTX 980 Strix DirectCU II 4GB x 2 in SLI
G.Skill Ripjaws 4 F4-2800C16Q-32GRK 32GB (4x8GB) DDR4
Samsung 850 Pro Series 512GB SSD
Samsung 850 Evo Series 1TB SSD>

Razer Naga (Left Handed) Mouse
Corsair K95 RGB Keyboard.


With the Asus X99 Deluxe

Il start with a little background, With the Asus X99 Deluxe. Basically April/May my old Kingston memory kit was faulty and after lots of testing and working with Kingston I was able to return it and swapped it out the Ripjaws (compatible on G.Skill Website).

I was over the moon when the new memory arrive popped them in enabled the XMP and of I went and after 6 months of issues I finally had a fully working stable system. Well it only lasted a few weeks before the cold boot issues, since then I have ruin through a lot of testing as follows and in no particular order;•

Bios Flash back several bios versions before returning to 1801
Removed and re-seated memory, graphics cards and CPU's
Checked all cables are plugged in properly
Cleared CMOS several times
Cleaned CPU socket and checked for bent pins several times and ensured in correct position
Disabled XMP

+ additional items as suggested on forums

Finally I had had enough and sent the X99 Deluxe back for RMA, it was repaired by Asus and returned to the retailer 6 weeks later and retailer tested it and advised me it was still faulty and issued a refund as my motherboard has been superseded by the U3.1, I then purchased the Rampage V Extreme U3.1 and finally after 8 weeks I had a new mother board.

Rampage V Extreme U3.1

Last week I installed everything taking my time to ensure everything was connected properly, completed a clean install of windows 10 pro and everything was working find for first 2 days (everything set to default settings in bios). Then 3rd morning I went to boot up my PC and although power LED's all lighting up on the mother board pc would not boot from cold, I have to switch off the power supply unplug from the wall and allow all power to drain from the system to start and that is not always which is also touch and go.

I have noted and attempted to try the LN2 which I believe is for the cold boot issue but this was in a bit of a rush so will attempt it again, I have ensured I am on the latest bios version. Removed and checked CPU, removed and checked graphics cards also tried switched to test them, removal and re-fitted memory kit, checked all cable connections, checked all case connections (reset/power etc)

I am really at a loss with this one and haven't had a fully working pc for 9 months other than my old PC which thankfully I kept.

I would really appreciate some help and advise maybe there is something simple I missed.

CPU is running at stock with turbo boost on which is default and memory is running at stock (XMP disabled).

Almost forgot the 4 pin power connector is also connected as I had the cable and was using SLI I thought best to have it.

[Menthol]

I have not had a cold boot issue but the LN3 switch should remain in the default position, that is cold but at -100 plus cold boot issue using LN2 cooling.

[Tw1sted]

Menthol wrote:
I have not had a cold boot issue but the LN3 switch should remain in the default position, that is cold but at -100 plus cold boot issue using LN2 cooling.

Thanks, it didn't help when I tried it so put it straight back to default.

I'm seriously lost and trying anything at this stage it has to be something silly that I have overlooked well I'm hopping so!

Tried removing battery also after full strip down, I'm now considering trying the original seasonic psu cables to rule that out.

[Tw1sted]

I'm trying all sorts racking my brain what could be the cause, I have notice that my keyboard sometimes has issue on boot and sometimes has to be unplugged and plugged back in to get it working.

Remove bloat software like AI Suite tonight, trying anything and everything.

[Tw1sted]

Tw1sted wrote:
I'm trying all sorts racking my brain what could be the cause, I have notice that my keyboard sometimes has issue on boot and sometimes has to be unplugged and plugged back in to get it working.

Remove bloat software like AI Suite tonight, trying anything and everything.

Well I may have found the issue so far so good, I removed and tested all psu cables, using the originals, no problems found.

Then went through all or cables, unplugged the USB3 front (case) connection and bingo seems there is a issue with the Corsair USB3 on my case, am going to test for a few days but I'm quietly confident its resolved.

Will post back later.

[Tw1sted]

Ok back to the drawing board, please help

I have now removed everything from the case and created a test bed and only put on memory module CPU, CPU cooler and 1 GPU and still boot issue is there., tried swapping to my other GPU just incase and same problem. Same problem on bios 2, have now tried flashing back from 1502 to earlier version and I cant figure it out.

When PC does start up it works perfectly just seems to be a boot issue of some description but cant for the life of me figure out what is causing it.

even swapped out PSU leads and CMOS battery.

Considering the Motherboard and memory has already been swapped out really only leaves PSU and CPU the two most unlikely components I would expect to have a problem and don't have a spare of either to test out.

PLEASE HELP!

[Tw1sted]

I now cant even get it to post it immediately comes up with Q Code 76 with PCIE LED 4 light flashing and the CPU LED permanently on, tried switching to bios 2 same issue, tried resetting the CMOS, tried test bench with minimal component, tried removing the CMOS battery, tried bios flashback to 3 different versions and am now at a complete loss. Don't have to recycle the power anymore to power it up that now works perfectly except seems likely I now have a much bigger issue.

Doesn't seem like anyone could offer me any advice with this one so looks like I will need to RMA the board and am going to have CPU, Memory diagnosed just in case.

[Tw1sted]

Well I resolved this finally, the Seasonic PSU was the problem, I had it replaced and paid a little extra for a Corsair AX1200i everything is now working like a dream!