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Asus Strix Z270i - Issues, Red CPU LED..

Malkan
Level 7
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!
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96 REPLIES 96

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https://www.youtube.com/watch?v=3ZGMo9QQmRI&t=6s

Above is my build I've been working on. Like almost everyone else here with the strix z270i Gaming I was having issues with a consistent stable boot with XMP enabled. My exact issue was that after enabling XMP or using the Asus auto overclocking utility, once every 4 to 10 boots system would sit with the red CPU LED lit and no additional activity. To get the system to boot I would have to press the reset button and then after around 10 seconds, the system would reboot and I assume skip either the CPU or RAM speed POST tests and then boot without fail.

After initially building the frame and cutting the first set of side panels I decided to spend some time working on the stability issues. This is after living with the issue for around a month and then switching to standard settings ( no over clock and ram at 2400-I think, LOL ) for around 3 weeks and system was very stable. I researched issue and narrowed it down to the DRAM, VCCIO and system agent voltages. The RAM timings could play a part as well as i did ease up the timings just a bit and haven't reduced them in fear of instability again. it took me 2 days of adjusting and restarting ( restarted system at least 50 times over a 2 day period to test stability.) before finding voltages and timings that worked. Please note that this is unique to my system and the mileage might vary depending on the CPU & RAM used. See Pics included for the settings.

I'll try to answer any questions any of you might have and the full parts list is in the youtube video as well.

i7 7700K was the faulty. Swapped for a new one, working flawlessly. Time for RMA again haha :cool:

Heres my final stable build

https://www.youtube.com/watch?v=yCdYZ4Rfgd4

KRiSX wrote:
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 😞






quark54 wrote:
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.



I just got home from vacation. When I leave for several days I always unplug all my electrical appliances like my TV and computer.
I got this exact same issue then.
Tried powering on, nothing happening, nothing on the screen and red LED light.
I push the power button long enough for the PC to shut off.
Try turning it on again and I get forced into the BIOS. I don't change anything at all.
Reboot and it works no problem.

So yeah. There must be an issue with these boards.

Are people still having this issue? I am and am wondering if a BIOS update or something has fixed it. If anyone has the Z370i, does that board have the same issue? Thanks.

i had issues with z270i and things kept getting worse and worse. Got it replaced to a new z270i and finally its working properly (knock on wood etc etc)!

BalleFranz wrote:
I just got home from vacation. When I leave for several days I always unplug all my electrical appliances like my TV and computer.
I got this exact same issue then.
Tried powering on, nothing happening, nothing on the screen and red LED light.
I push the power button long enough for the PC to shut off.
Try turning it on again and I get forced into the BIOS. I don't change anything at all.
Reboot and it works no problem.

So yeah. There must be an issue with these boards.


Came home after the power company had been switching out the power meter (all power was cut for some time as a part of the switch) and I had this same issue.

  • Turn on, red LED.
  • Force shutdown with holding the power button.
  • Automatically get thrown into the BIOS.
  • I exit without changing anything at all.
  • Boots to Windows no problem.



I'm using the BIOS that the board shipped with in February.