Asus Strix Z270i - Issues, Red CPU LED..

[Malkan]

Hey,

So i built a new PC a few days ago and today when turning it off and moving it to a new desk, issues occured. (Rarely turn my pc´s off). After having it moved to the new desk, i plugin all the cables and start the pc - Wont POST and CPU_LED is lightning solid red. Pressed reboot button, took 5-10 sec then it rebooted and started flawlessly into windows.

I can reproduce the issue 8/10 times (tested) by turning PC off, pull power-cord out and wait 3-5 min each time, then it most likely wont post and getting stuck with red cpu led. It did happen once when i tested just rebooting system a few times aswell. I have reseated CPU + Cooler, no joy. Cant spot any bent pins, looks fine to me. I have no OC, only XMP turned on (3000mhz Corsair) rest is stock + fast boot turned off. The PC works flawlessly in Windows, been running stress-tests (Realbench) for 2 hrs. Will run overnight aswell.. Works fine in games, been playing Wildlands all week without hiccups.

I tried to reproduce the error with XMP turned off = Bios completely stock. Only tried 3 times, it booted every time fine, i will try more times to reproduce the issue with XMP off. So far with what i have tested, it seems to be a issue with xmp/bios, any suggestions? Been using google most of the day and it seems to be the exact same issue that people HAD with Asus z87-a, been reading quite a few topics about that which match my issues very well.

Specs:
Asus Strix z270i-gaming @ latest bios 0607 - Same issue on both available bios.
Intel i7 7700k (Delidded with Rockit88 delid tool) - works fine, had to be done because of 85+ temps @ stock in games, 90+ Aida64.. Now around 65c.
16GB Corsair 3000mhz ddr4 - CMK16GX4M2B3000C15
Asus GTX 1080Ti
Samsung 960 EVO 250GB M2 + 2x 250GB 850EVO.
Corsair AX1200i PSU
Corsair H100i v2 cooler
Corsair Obsidian 250D

Hopefully someone have a answer 🙂 Thanks!

[Buellersdayoff]

The incompatibility is software/firmware development and asus themselves lol
A cpu issue is less likely, it's probably the board or something screwed up in the bios, just look back through this thread

[Legolas]

The CPU QLED only shows up when CPU is having issues or the motherboard. From my experience, the CPU is usually the cause of this issue. Simply, remove the CPU and test it on another motherboard. If there is a processor lying around, please test a good one to find out if the motherboard is working or not. I bet you will find the root cause by this testing method. :cool:

[Farinasaur]

Legolas wrote:
The CPU QLED only shows up when CPU is having issues or the motherboard. From my experience, the CPU is usually the cause of this issue. Simply, remove the CPU and test it on another motherboard. If there is a processor lying around, please test a good one to find out if the motherboard is working or not. I bet you will find the root cause by this testing method. :cool:

Or maybe the motherboard is faulty and unable to lit the correct led? Already sent it to RMA, let's wait for ASUS answer...

[Grumpy_OLD_git]

HI.

+1 for the no boot issue with Corsair Vengeance LPX 32GB (2x16GB) DDR4 DRAM 2666MHz C16 Memory Kit - Black

Run at stock setting and no problems. turn on xmp and the machine will boot until its switched off at the wall, then it will refuse to boot back up, until ram settings set to default.

[KRiSX]

Just wanted to add my 2c to this thread... I just down/side-graded to this board from a Maximus VIII Gene where I was running my i7 6700K and GSkill 2800mhz DDR4 and GTX1080Ti with absolutely no issue...

There is obviously an issue with these boards if so many people are having the same/similar enough issues. I've discovered that it doesn't make a damn bit of difference what my settings are, using XMP or not... As soon as power is removed from my system... RED LED on the board! If I don't remove power from the system completely, I can shut it down and start it up again no problem. To prove to myself it isn't a setting in the BIOS here is what I did...

* Reset Defaults
* Booted Windows
* Shut down
* Turned on
* Booted Windows
* Shut down
* Flicked power switch on PSU (same as pulling the plug)
* Turned on - RED LED TIME

I repeated this same process, but applying all the settings I want in the BIOS, including a mild 4.5ghz o/c and it did the exact same thing... now what I have to do to get back into Windows after getting the red LED is to simply hold the power button for 5-10 secs to force the system off... Then I just turn it back on, it'll complain about it not posting and force me into the BIOS with F1... I do that, go into bios and immediately exit without changing a damn thing and waddaya know... it boots into Windows...

System is 100% solid, I've been stress testing the hell out of this thing and it doesn't skip a beat... all until you remove power from the PSU...

Whats going on ASUS??? I was hoping a BIOS update would fix it, but I'm on the latest there is and no change... very unhappy 😞

[No0B25]

parseInt32 wrote:
This settings solved my usse with the red light. Ram model: CMK16GX4M2B3200C16, Bios: 0704
I leaved the CPU Offset to auto instead of +80mV

Yup. I eventually figured as well that it was just as stable without the overvolt. I actually undervolted vcore to about 1.17v at boost clock (was at 1.23v stock) and it still runs just fine. Didn't have a single issue with the system ever since, other than that annoying popup of the audio driver telling me the impedance of my headphones everytime I plug them in.

KRiSX wrote:
I was hoping a BIOS update would fix it, but I'm on the latest there is and no change... very unhappy 😞

Only thing I can think of is check the System Agent and VCCIO voltages and tweak them to see if that changes anything. It's been the crux for some of the ones affected. You sound like someone who knows their way around things, but check the mounting pressure of your CPU cooler just in case. Caused me some seemingly totally unrelated problems in the past.
Could also be caused by what the PSU you're using does when its switch is flipped. Which PSU do you have?

[KRiSX]

No0B25 wrote:
Could also be caused by what the PSU you're using does when its switch is flipped. Which PSU do you have?

Well I get the same result if I unplug the power cord from the PSU so it just seems to be removing power from the system causes the issue... I've had this PSU for years... it's a Silverstone 850w from memory, but I can't recall the exact model off the top of my head...

[Buellersdayoff]

Disable fast boot in bios

[quark54]

Yep, just built a system for my daughter, with Z270I Strix. Same issue, cold boot failure.

This is with the latest BIOS. Fast boot off makes no difference, optimised defaults makes no difference. Clearly a BIOS issue.

This has been going on for a while now according to this thread. So WHEN will Asus fix this?

After two or three attempts it boots, but very annoying.

[Farinasaur]

Sent the Z270i to RMA, received a full refund.

Bought a Maximus IX Formula, guess what? RED CPU QLED WHEN VGA IS CONNECTED!!!!

Tested the VGA on another PC, worked flawlessly. Did the same with the RAM, no issues. PSU tester says everything is fine (EVGA G750 P2) so I'm going to buy a Celeron and test it again.\

I'm totally annoyed with this scenario. :mad: Maybe it's the CPU, it damaged the Z270i and probably damaged the Maximus IX as well....