Motherboard is not a standard form factor, so a standard ATX board will not fit in the case. The case wiring itself is not standard ATX either. To replace the board with an aftermarket ATX board will require a new case.   If you have the original memory, put it in and disconnect all other devices including USB devices and do a CMOS reset by removing the coin cell battery. It's not uncommon for aftermarket memory to act up, even if they have been working fine for months before.   If that does not work and a BIOS recovery option does not work either, than a motherboard replacement will be your only choice. Answer from Vanadiel on dell.com
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JustAnswer
justanswer.com › computer › bhr2u-aurora-tower-computer-light-alien-s.html
Expert Solutions for Alienware Aurora R12 Blinking Yellow Light and More
A blinking Alien head light on the Aurora Tower typically signals hardware issues or system warnings. First, check the AlienFX lighting settings in the Alienware Command Center to rule out software glitches.
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Reddit
reddit.com › r/alienware › aurora r7 power button just keeps flashing yellow, anyone know what the issue could be?
r/Alienware on Reddit: Aurora R7 power button just keeps flashing yellow, anyone know what the issue could be?
August 28, 2020 - Mines doing the same shit flashing yellow 4 times i did the ram reset i tried turning it on without ram doesnt work i tried one stick in doesnt work, i did put new ram in it like a year before this started happeningbhh ... Welcome to the unofficial community for Alienware.
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Dell
dell.com › dell community › desktops › alienware desktops
Aurora R8, yellow light flashing 4 times on power button | DELL Technologies
November 21, 2020 - We're making progress...4 flashes down to 2 flashes...we'll get to no flashes soon.
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Reddit
reddit.com › r/alienware › flashing yellow light - alienware aurora ryzen edition​ r10
r/Alienware on Reddit: Flashing Yellow Light - Alienware Aurora Ryzen Edition​ R10
December 1, 2021 - Welcome to the unofficial community for Alienware. We are not an official Dell sub. Please read the rules and FAQ before posting. Thanks! ... Driving PSA: If you come to flashing yellow lights at an intersection DO NOT stop.
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Dell
dell.com › dell community › desktops › alienware desktops
Aurora R10, working fine, 2,1 yellow blink code | DELL Technologies
February 2, 2022 - The blinking 2,1 I have is yellow. ... Ok its running at 3200Mhz but what are the timings? The only advantage of using aftermarket RAMs are the timings. The oem Kingston memory in my R10 did support 3200Mhz but with slow timings. I use CRUCIAL BALLISTX memory now and it runs without any issues with 3200Mhz and timings of 16-18-18-36. But as Vanadiel said the Auroras are quite picky with the RAMs.
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YouTube
youtube.com › relaxation karma
Aurora Alienware Flashing Yellow Light Solved - No Post PC - YouTube
Aurora R6 2017 Yellow Flashing Yellow No Post Solved - Solved the 3,7 yellow flashing alien head which changed to the 5 yellow flashing light on the Aurora. ...
Published   August 13, 2017
Views   23K
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Dell
dell.com › dell community › desktops › alienware desktops
Aurora R6, 4 yellow flashing lights | DELL Technologies
October 17, 2019 - I've just fixed an issue for another to arise. When I try to start up my Alienware Aurora R6, the logo flashes yellow 4 times with a pause until I turn it off. It won't launch and I can't seem to f...
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Dell
dell.com › dell community › desktops › alienware desktops
Aurora R5 power button blinking yellow and pc won’t start | DELL Technologies
April 28, 2018 - I got home yesterday and updated my pc, and now whenever i try to turn it on the power button blinks yellow 3 times, stops and then blinks another 6, my keyboard and mouse both still have power so i’m guessing its not a power issue ... http://www.dell.com/support/manuals/us/en/04/alienware-aurora...
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Reddit
reddit.com › r/alienware › alienware aurora r11. one blinking yellow light.
r/Alienware on Reddit: Alienware aurora r11. One blinking yellow light.
June 12, 2022 -

After trying to turn on my pc it doesn’t turn on but it does emits one yellow blinking light every 5 seconds. My power supply is getting power because the green light lights up when I press the button on the back. I researched the diagnostic codes and according to the website it means “bios and rom failure”. I took it to the shop and they had it up and running immediately. My computer was working fine after that for a few days and then it started messing up again by not Turning on and blinking one yellow light again. I haven’t took it back to the shop because I managed to get it back up and running a few times on my own, But do anyone have any suggestions on how to fix this issue ? Idk what’s causing this is happen. And what does bios and rom failure means?

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Reddit
reddit.com › r/alienware › aurora r10 - flashes yellow twice and then once
r/Alienware on Reddit: Aurora R10 - flashes yellow twice and then once
April 30, 2021 -

Hello

Computer is pretty new (around a month), all been going really well. However i decided to turn off my overclocking on the CPU (using the Alienware command center) as ive been reading its not worth doing (i have a 5800x). It asks me to restart my computer and now it will not boot up. The alineware head flashes twice and then once. I spoke to customer care and they are going to send someone but it wont be till next week, the flashing light combo means a CPU problem. I tried power cycling and trying to get into BIOS but neither thing works. Anyone have any ideas or do i just need to wait for the engineer to come and replace my CPU? The CPU was working really well before, i cant see how it would break by me just turning of the auto boost?

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Reddit
reddit.com › r/alienware › aurora r6 yellow flashing lights
r/Alienware on Reddit: Aurora R6 yellow flashing lights
October 13, 2020 -

So I’m trying to upgrade my R6 from a i7-7700 to an i7-7700k and once I replaced the cpu every time i go to boot up I get 4 yellow blinking lights. When I swap back to the 7700 the system just constantly restarts. Any idea on what may be going on, or possible solutions?

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Besides three amber how many white led blinks do you have? Blinking amber—Computer is experiencing a boot failure but the power-supply unit is functioning correctly. The power-status light may blink amber or white according to predefined 'beep codes' indicating various failures. Table 1. Diagnostic light codes DIAGNOSTIC LIGHT CODES (AMBER, WHITE) PROBLEM DESCRIPTION 1,1 TPM Detection Failure 1,2 Unrecoverable SPI Flash Failure 1,5 EC unable to program i-Fuse 1,6 Generic catch-all for ungraceful EC code flow errors 1,7 Non-RPMC Flash on Boot Guard fused system 2,1 CPU configuration or CPU failure 2,2 System board: BIOS or Read-Only Memory (ROM) failure 2,3 No memory or Random-Access Memory (RAM) detected 2,4 Memory or Random-Access Memory (RAM) failure 2,5 Invalid memory installed 2,6 System board/Chipset Error 3,1 CMOS battery failure 3,2 PCI of Video card/chip failure 3,3 BIOS Recovery 1: BIOS recovery image not found 3,4 BIOS Recovery 2: Recovery image found but invalid 3,5 Power Rail Failure: EC ran into power sequencing failure 3,6 Flash corruption detected by SBIOS 4,1 Memory DIMM power rail failure 4,2 CPU Power cable connection issue
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I am not sure but I think it was 3,1 which would be cmos. But if I switch ram slots fro. 2/4 to 1/3 I get no blinking lights so I could be wrong on the color. I was using g skill ripjawsv 3600mhz. I have the original ram as well and put that back in but I can't get anything to come on the screen. Last time this happened I changed the frequency ram to the wrong on in bios and did a cmos reset and worked fine. For some reason when I tried shutting down I got a grey screen so idk what happened.
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Reddit
reddit.com › r/alienware › aurora r10 -2 blinking yellow lights - no ram detected
r/Alienware on Reddit: Aurora R10 -2 blinking yellow lights - no ram detected
January 11, 2022 -

I just recently got an Aurora R10 and set it up yesterday. Today I started it up and it ran fine for about half an hour then it shut off. Now it will not turn back on and is showing 2 blinks of a yellow light, then a pause, then another 2 blinks. I looked it up online and it says that light code means there is no ram detected. I have opened it up and checked out the memory cards and they are installed correctly so I’m not sure what the issue is. Anyone have an idea?