z490 Tomahawk CPU Debug LED Stuck on after latest BIOS update

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datz.bunz

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Just this morning I updated the bios to the latest one which is 7C80v18. Update went fine and when the pc rebooted, no display was shown and the cpu debug was lit and stayed on. After 3 hours I power cycled the pc and the had same result of the CPU Debug led being lit.
I have tried everything from removing/replacing the cpu, putting one stick of ram in the first or second slot, cmos reset (battery removal and replacement), removing all usb devices and gpu etc, still no luck.
Wondering if anyone else had this issue and what they did or if they had to RMA the board.
 
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Hello, exactly the same problem. The motherboard has crashed after updating to the latest version that was available from the MSI application. I hope MSI will take it upon itself. The motherboard is under warranty bought in the tolvulistinn store
Greetings from Iceland.
 
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Not only happening on this board , happen to me on the MSI Z490 Gaming Edge yesterday too going from V16>V17 via M-Flash

RMA is the only fix I have been told - 2-4 week wait - not possible , it is my new CAD Workstation.....
 
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MSI ppl. are checking for this issue, with different hardware combinations and so far that issue can't be duplicated.

To anyone who has this issue, can you please provide those details:

* From which BIOS version to which you have flashed to?
* What CPU you use?
* How the BIOS was flashed? M-flash? Live Update? Other way?


Thanks
 
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Ok, I start even though I already got a replacement board, but I'm still interested what caused this.

1. My board is a Z490 Tomahawk and I flashed from 7C80v17 to 7C80v18.
2. I used M-Flash to update the BIOS, which completed successfully.

CPU debug LED lights and doesn't continue with post process.

Specs:
CPU Name
Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
Motherboard
MSI MAG Z490 Tomahawk (7C80-004R)
Memory (RAM)
Total Size 32GB 2x16GB moduels
G.Skill RipJaws V schwarz DIMM Kit 32GB, DDR4-3200, CL14-14-14-34 (F4-3200C14D-32GVK)
GPU Type
XFX Speedster MERC 319 Radeon RX 6800 XT Black Gaming (Navi 21 XT)
Storage (HDD/SSD)
Model #1 Name Samsung SSD 970 EVO, 512GB, M.2
Model #2 Name Samsung SSD 970 EVO, 512GB, M.2
Model #3 Name KINGSTON SKC400S37512G, 512GB, SATA
Display
ASUS VG275Q
Windows Version Microsoft Windows 10 (10.0) Professional 64-bit
 
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My motherboard is MSI Z490 edge
cpu i7 10700k
after BIOS 1.70 update I have a black screen
any help?

I have tried every method available on the web but with no luck.
The LED debug for CPU is on.
Flashed with live update
 
Last edited:
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mace014ea02cd said:
Ok, I start even though I already got a replacement board, but I'm still interested what caused this.

1. My board is a Z490 Tomahawk and I flashed from 7C80v17 to 7C80v18.
2. CPU is a 10700K.
3. I used M-Flash to update the BIOS, which completed successfully.
Click to expand...
sa3aa14e902d9 said:
My motherboard is MSI Z490 edge
cpu i7 10700k
after BIOS 1.70 update I have a black screen
any help?

I have tried every method available on the web but with no luck.
The LED debug for CPU is on.
Click to expand...
I think they want a full hardware list
something like this
You can get all of this if you have done a CPU-Z Validation

CPU Name AMD Ryzen 9 3900X 12-Core Processor
Motherboard
Model MSI MAG B550M MORTAR WIFI (MS-7C94)
BIOS American Megatrends Inc. 1.52 (11/13/2020) Updated to Bios American Megatrends International LLC. 1.71 (04/29/2021)
Memory (RAM)
Total Size 64GB 4x16GB moduels
Timings 16-18-18-38-75-1 (tCAS-tRC-tRP-tRAS-tCS-tCR)
G.Skill 16384 MB (DDR4-2137) - XMP 2.0 - P/N: F4-3200C16-16GVK
GPU Type AMD Radeon RX 5700 XT (Navi 10 XT)
Storage (HDD/SSD)
Model #1 Name CT2000BX500SSD1 (FW: M6CR030)
Model #2 Name Western Digital WDC WDS100T2B0B-00YS70 (FW: X61190WD)
Model #3 Name CT2000BX500SSD1 (FW: M6CR030)
Model #4 Name Samsung SSD 850 EVO M.2 500GB (FW: EMT21B6Q)
Model #5 Name APS-SE20Q-2T
Display
Screen #1 Kogan TV (KON0030)
Screen #1 Spec 52 inches (132.1 cm) / 3840 x 2160 pixels @ 59-70 Hz
Windows Version Microsoft Windows 10 (10.0) Professional 64-bit
 
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My motherboard is a Z490 Tomahawk and I flashed from 7C80v17 to 7C80v18, use Live update like always.
10900 k
palit rtx 3090
gigabyte 850 W
2*16 gb corsair venegance
without overclocking.
The LED debug for CPU is on.
 
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My motherboard is a Z490 Gaming carbon wifi and I flashed from v1.70 to 1.80 use Live update MSI- or Dragon -Center.
I9-10900K
GTX 1080
XFX XTR 1050 power
2*16 gb Kingston HyperX
without overclocking.
The LED debug for CPU is on
Screen allways black, cant see bios , tested with and without pcicard, both mb connection, ...
no M-Flash possible on this motherboard
 
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Argh. Just submitted a question tech support RMA ..
I updated from 1.7 to 1.9 via USB M-Flash it completed but upon reboot no display and CPU light is on.
Have a i7-10700k also and the z490 MPG Carbon Gaming Wifi... Surely there is some way to fix other than posting for RMA?! Seems insane.
 
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unplugged everything, cmos battery everything just have power cord. CPU light just turns on right away. Regardless even if ram is out. Couldn't happen at a bloody worse time. ffs..
the M-Flash in Bios completed but following reboot just nothing. Have both the onboard displayport and hdmi into a monitor to no luck. sigh
 
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I contacted MSI tech support with this similar problem with the B450 Max Tomahawk mobo with an AMD Ryzen 5 2600x CPU. I attempted the update via 'live update' as I've done many times before with success. Also, CPU debug LED is on even with no CPU installed. Also did the USB Flash Bios per manual and still nothing. BIOS version attempted update: 7C02v3B
 
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sailndb said:
I contacted MSI tech support with this similar problem with the B450 Max Tomahawk mobo with an AMD Ryzen 5 2600x CPU. I attempted the update via 'live update' as I've done many times before with success. Also, CPU debug LED is on even with no CPU installed. Also did the USB Flash Bios per manual and still nothing. BIOS version attempted update: 7C02v3B
Click to expand...

This is an unrelated problem, i'm pretty sure. For Z490, there are potentially dangerous BIOS updates available. For B450, nothing of the sort has been reported yet, so you have an isolated case with some other background.

Of course the CPU debug LED will light up when there is no CPU in the socket. The engine light in your car will also come on when you take the engine out, i reckon 😄

For the Flash BIOS Button method, you have to do it exactly by the book. Rename the file to MSI.ROM and all that stuff. Try different USB sticks and try formatting them to FAT32 using Rufus.
 
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Not isolated.....just search b450 and you will see other similar events. CPU debug LED is on with CPU in and out.....got it? No memory installed.....does RAM LED light up? Nope! Flash bios method was done per manual and with different sticks all formatted per manual. nuffsed! Theory......using Live Update could lead to the impending disaster. I've yet to get any reply from support.
 
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sailndb said:
Not isolated.....just search b450 and you will see other similar events.
Click to expand...

Ok, i haven't searched for it specifically, but i take your word for it.

sailndb said:
CPU debug LED is on with CPU in and out.....got it? No memory installed.....does RAM LED light up? Nope!
Click to expand...

The CPU debug LED will come on with a CPU problem and a missing CPU. Look at the manual: "CPU - indicates CPU is not detected or fail." But the EZ Debug LEDs usually stop then, so it will stay on CPU LED and not proceed to RAM when there's a CPU problem or CPU missing. Without a CPU or with a CPU problem, it can't properly test the RAM, because the memory controller is inside the CPU.
 
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