Just built a new PC and it won't boot.

Trying to update BIOS and I get the "solid green lights".

The only instruction I can find is "Please make sure that you plug the USB drive to the USB BIOS Flashback port".

But what should I do to not kill my MB?

Extract the USB drive? Turn the PSU power off? Press the bios button again?

I just got the motherboard and I only have the 24 pin cable from the power supply connected. It has been stuck in a flashing green light for the last 45 minutes.

What's going on? How do I safely abort this process safely!?

I'm now finding out that my USB drive might be too big since it's 16 GB instead of 8 GB or below.

Hello ASRock experts, I recently put together an SFF build with the b650i lightning wifi: https://www.reddit.com/r/sffpc/s/hN7RiPZVCb

I could swear that the BIOS flashback LED used to be off at first. First thing I did was to update to the latest BIOS, 3.01. All good. Windows install and messing around with some Rysen Master settings got me to have to do a BIOS flashback (super grateful for this feature, thank you ASRock!) which went well. However now the BIOS flashback LED is on and green all the time, whether the system is on or off. Is this normal? My system seems to be running fine. I also don't want to disable the LED in the BIOS because I think it's useful in case I need to BIOS flashback again.

Any thoughts and tips would be appreciated ✨

CPU: 7800x3D

Motherboard: Asrock x670e steel legend

GPU: rtx 4080

SSDs: Solidigm p44 2tb, wd sn850x

PSU: FSP Hydro g pro 1000w

RAM: g.skill trident z5 neo EXPO 6000-30cl 2X16(32gbs)

Air cooler: noctua nh-u12a

Hello, I just recently put together my first computer in over 10 years, as well as this being the first time I ever had to update a bios. After consulting the manual and looking at videos online, I tried to do a bios flashback. Formatted my usb to fat32, put it in the appropriate usb slot on the I/O panel, renamed it to "creative.rom", and when I tried to do it nothing happened. no blinking green light, nothing at all. tried it a few more times and nothing worked. Turned off my psu unit and looked up other ways online to update the bios, and found the "instant flash" method by doing it from within the BIOS menu itself. put in the usb key with the file (I am upgrading to 1.28 bios, not 2 because I have read many people reporting a lot more hotter temperatures on their cpu). I then proceeded to try this instant flash method, and when I plugged in the usb stick and turned on the PSU, the flashback button started to flash green, even though I didnt click the button this time around! Problem is, the led has been flashing for over an hour now. I am super confused as to what I should do next. I am told that if you interrupt this process, it can brick the motherboard? if that is the case and it doesnt stop blinking, then what can I do? is there no safe way to stop or interrupt this process? can I just turn on the computer? can I turn off the PSU and remove the usb? please any help here would be greatly appreciated. I finally build a brand new computer that I wanted for some solid gaming, as well as for work, and now this happens, I really dont want to damage anything but I have no idea how to proceed. If anyone knows about this, or has any idea about how I can proceed I seriously need some help and am getting nervous about how to proceed.

A couple of days ago my PC got the issue of not booting. It didn’t matter if the PC was turned off, or in sleep mode. It always got stuck with the green solid light. In the beginning it would boot after a couple of restarts - green light disappeared, but a solid white light has been shown on the mainboard. Today my PC didn’t boot at all. Just the solid green light, Screen stays off, nothing happens. Except after one of the restarts, green light was replaced by the white light and you can see on the attached picture what was shown on my screen. That’s it! I guess my PC is, or for that matter, my Mainboard and CPU are dead. Or do you have any suggestions what can be done for troubleshooting? I already looked up the issue here on Reddit and on google, but nothing helped so far. I also don’t have another PC where I could test my parts if they’re working.

Idk how Asrock can still sell mainboards after this whole fiasco. Besides that I’m also an idiot for trusting Asrock, but that won’t happen ever again.

Hi all, wondering if I could get some technical support advice, I've just put together a pc and it's not posting no matter what I've tried by reading every other post I can find.

System: MB: B650m Pro RS BIOS: 1.28 PSU: Corsair RM750x CPU: Ryzen 5 7600 GPU: Sapphire Pulse rx7800 xt Drive: Crucial P5 2TB RAM: Corsair Vengeance 2×16GB 6000mhz cl36

So here are the troubleshooting steps I've tried so far -reseating all cables from PSU -trying to boot without GPU -reseating everything (RAM, CPU, cables again) -Clear CMOS -left trying to boot for 40 minutes as I've seen it can take some time -tried with one stick in each slot -Tried with the other stick in each slot -tried with a different set of ram

And I've tried the BIOS flashback with a 4gb usb drive formatted fat32 16kb partitions using both Windows and Rufus, using MBR partitioning, I've been renaming the file to creative.rom, and I've tried with 3 usb drives of varying ages and capacities, I'm using the correct slot, I've check that in the manual a dozen times, and I've tried with everything removed from the motherboard but the motherboard power, but every time after holding down the button for 3-5 seconds the light just stays solid green.

So at this point I'm pretty much out of ideas, and I'd welcome any other suggestions.

Update: this is one of 2 AM5 builds I was going to do this weekend, so I've built the other one, and it boots up fine, and I've swapped in the CPU and RAM from the system that won't post, and the CPU and RAM work fine, so it's definitely a motherboard issue, think I'm going to have to return it at this rate.

Update 2: Thanks everyone for your suggestions, I've ended up RMA'ing the board and they've decided it's faulty too, so just waiting on them to send the replacement out now.

I recently tried to update my B650I Lightning Wifi to BIOS version 3.10 but upon reboot after the update, the PC wouldn't boot at all (Power button is on and fans are spinning etc. But nothing in the screen).

I attempted to clear CMOS but it didn't work so I tried doing USB flashback. I plugged in my USB (3.0) to the flashback port with the BIOS file renamed as CREATIVE.ROM, extracted to the root of the drive, but it won't read my USB drive. My flashdrive is in the FAT32 format and I double-checked with BOOTICE.

The Bootflash LED flashes then turns solid green indicating that the BIOS flashback isn't working.

Has anybody had any success with getting the B650I Lightning Wifi flashback to work? I've attempted unplugging everything but the CPU but it doesn't seem to help.

TL;DR; I was trying to resurrect my 9800x3d on my X870E Nova but I was not flashing the bios correctly, after proper flashback things work again, here's how to make sure you flash the bios the right way.

Hi,

yesterday 9800x3d joined the 00 post error club - it was working fine a day before and it suddenly failed to boot. I've tried the stuff you can find online, bios flash, cpu reseat, cmos reset without any success.

After digging around I found out that I'm a complete noob - I thought I was flashing the bios but in reality it was failing. I'm going to blame ASRock here a bit, the flashback instructions are misleading - the BIOS flashback button is blinking red when it starts but then you really need to watch a small green led on the motherboard to know the status of the flashback.

Long story short, after properly flashing to 3.20 the PC booted and works fine.

That prompted me to write a short guide on how to really flash the bios:

• Turn off the machine, keep the power cable plugged in and the PSU on (but don't start the PC).

• On a separate machine

  • Download the bios from ASRock website

  • Find a spare USB stick and format it to FAT32 (this step is important, FAT32 is old and some systems may not want to format 128G USB stick to FAT32, I have an old usb stick from EVGA that was already formatted with FAT32 so I can't really advise you here)

  • Unzip the bios and copy the rom file to the USB

  • Change the bios filename on the USB key to CREATIVE.ROM (I'm not sure if it is case sensitive or not)

  • Unmount/sync/remove the USB key safely to avoid data corruption (exact method depends on your OS)

• Plug the USB key into the Flashback USB slot on the back of the motherboard (next to the Ethernet port - see pic)

• Hold the Bios Flashback button for 4 seconds, the button will start blinking red.

• Find the Bios Flashback LED on the motherboard (see pic, it's not the button you just pressed!)

• If it's solid green - the flashback failed, you did something wrong

• If it's blinking green - great, the flashback is in progress

• Wait for the Flashback LED to go dark (took about 10 minutes, wait for the LED to stop blinking, solid green is bad).

• Remove the USB key, cross your fingers and press the power button.

Hopefully this will help you bring your machine back to life. I can't really help with any troubleshooting or take responsibility for any damages - after all you are flashing bios and power outage at the wrong time can have some bad consequences, on the other hand, with 00 post code your PC is a fancy potato now so why not try?

Good luck!

If you’re getting the green boot light hang on your ASRock AM5 board (system won’t POST after it’s been off for a while), I might’ve found the cause.

I've been testing the entire evening, and these are my findings!

In BIOS, under OC Tweaker → DRAM Profile Configuration → DRAM Performance Mode, you can switch between AMD AGESA Default, Competitive, or Aggressive.
Switching to either Competitive or Aggressive changes a bunch of tertiary timings (tRDRDScl, tWRWRSc, tWRWRDd, etc.) in OC Tweaker → DRAM Timing Configuration.
Normally, these are set to Auto when using the AGESA Default mode.

The problem: when you switch back to AMD AGESA Default, those values don’t actually revert. They stay fixed instead of going back to Auto.

That leftover tuning messes up cold training with EXPO enabled, causing the board to hang on the green BOOT light until you power cycle.
Manually setting those timings back to Auto fixes the issue largely for me.

Images: https://imgur.com/a/EXt1A6k

UPDATE 30-10-2025:
While the above steps made the issue less frequent, enabling LN2 Mode completely resolved it.
You can find it under:

Advanced → AMD Overclocking → AMD Overclocking → LN2 Mode

This fix was suggested by ASRock support, and it immediately stopped the cold-boot hangs with EXPO enabled.

Why it helps:
LN2 Mode slightly relaxes the voltage and timing limits that the BIOS uses during memory training, especially on cold starts. That gives the CPU’s memory controller and RAM a bit more margin to initialize reliably, even when the system has been powered off for a while.

I hope this helps for some of you as well! If it helps for just a few, I'm happy to have shared my journey.

System info:

• CPU: 9800X3D

• Memory: Corsair Vengeance 64GB, 6000MT/s 30CL CMH64GX5M2B6000Z30

• GPU: RTX 5080

• BIOS Version: 3.50

Hi, I'm trying to flash the BIOS of my a620i for quite a while now and tried a lot, but with no luck. These are my tries:

• unplug and plug in the CMOS battery

• using different USB 2.0 drives

• renaming the ROM file into PSPBIOS.IMG (official name from the manual) and CREATIVE.ROM (I read this name in a guide somewhere in this subreddit)

• BIOSUBU.BIN is on the USB drive as well

• formatting the USB drive into FAT32 + MBR

I'm using a Ryzen 5 9600X CPU. The CPU cooler and the PSU fan are rotating. My initial idea for updating the BIOS is, because I get no picture via the HDMI port.

What happens when flashing: First its blinking for around 3min and then the permanent green light appears.

If anyone has an idea, I would be super thankful.

Just started my first build, I was aware I may had to do a bios update and I do because my bios is not up to date for my 5600 cpu. So I got a 32gb usb and formatted it to FAT 32. Went to the asus website and downloaded the latest bios for mobo. Did the renamer and put the CAP file in my root folder. Light turned solid green, searched reddit and found the convert to mbr and did that, then used disk management to "add volume" which aloud me to put it into FAT 32 and put files on the drive after converting to MBR. I am still getting a green light and have no clue what to do from here. Can anybody help me out or point me in the right direction?

Deleted last post to fix orientation & add parts since I forgot to. 9800X3D & X870 Pro RS WiFi - Been stuck on 3.50 since it came out. Every time I try to update the bios it just reboots back into windows. I’ve disabled encryption & FTPM & tried different USB ports. RMAd to CLX last year after one month of having it. They replaced the CPU and kept the same board. I think it took a shit, again. I get the dreaded red light during boot up at least once a month. Any help would be greatly appreciated. I hope I don’t have to spend $250-$900 on new parts but I feel like I may have to

Today I received my new PC build with the so-called "death kit" (ASRock X870 Pro RS WiFi + R7 9800X3D), and I’ve spent around 4 hours trying to update the BIOS version of the motherboard. I haven't installed the CPU yet to avoid frying it on first boot.

I’ve been following the instructions from this link without any success: https://www.asrock.com/support/QA/FlashbackSOP.pdf — I tried every BIOS version available on ASRock’s website, from the first to the latest.

The green LED blinks for about 5 seconds and then stays solid, which (from what I’ve read) indicates a failure — though there could be many possible causes.

Can anyone give me a hand? There must be a way to find out the current BIOS version so I can install the next one.

I’m going to rma it. I’ve tried 2 different USB’s idk what to do at this point.