Question MSI B450 Gaming Pro Carbon Max Wifi and AMD 5700x3D won't boot

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Similisora

Similisora

Jan 4, 2025
26
0
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Hello,

I recently received a new CPU (AMD Ryzen 5700x3D) but I can't start my PC with it, it is stuck on the CPU red light on my motherboard. I litterally tried everything I found on Internet (reddit, MSI, AMD, etc.) but nothing worked for me.

Before this, I had an ADM Ryzen 3600 and everythings was working fine. If I put it back, this is ok.

There is my setup :​

  • Motherboard : B450 GAMING PRO CARBON MAX WIFI
  • CPU (old -> new) : AMD Ryzen 5 3600 -> AMD Ryzen 7 5700x3D
  • GPU : GeForce RTX™ 2060 GAMING Z 6G
  • RAM : Corsair VENGEANCELPX16GB (2 x 8 Go) DDR4 3600 (Pc4-28800) C181.35V
  • PSU : Seasonic Core GM - 650W (80 + Gold)
  • SSD 1 (OS) : Samsung 970 EVO Plus
  • SSD 2 (Data) : Samsung SSD 860

What I have already tried :​

MOBO side :

  • I flashed the bios to the version recommanded on the official MSI support site (7B85v2E). Then I tried the latest beta version (7B85v2G1). Same thing, still stuck with CPU red light.
  • I checked if CPU was really ok for my B450 mobo, and yes : https://fr.msi.com/Motherboard/B450-GAMING-PRO-CARBON-MAX-WIFI/support#cpu
  • I cleared the CMOS : first I use the jumper (shorting the two pins with a screwdriver), then I removed the battery (>15 min) and press power button to drain all remaining electricity).
CPU side :

  • There is no pin bent on the CPU. A tech store near from my house tested it on an other mobo and they confirm me that it's working. So it's not an issue about the CPU.
  • I bought an AMD Ryzen 5700x (not 3D) and everything works with it.
  • I tried to wait 5min while booting but still stuck on CPU red light.
Memory side :

  • I tried to boot with only one RAM : same issue. I tried the 4 slots.
  • I removed the 2 RAM : the red light goes to DRAM. So CPU seems POST. But as I said, the CPU is working on another mobo.
  • I checked the RAM compatibility and it seems OK (DDR4 3600). The tech in the store tried with another RAM and still won't boot.
PSU side :

  • I checked the PSU connected to the 8 CPU PWR pins : all seems fine. I don't think I need the last 4 for a 105W CPU.


So it seems to be an issue with the BIOS, as the 5700x works but the 3D does not (new 5000 series). On the MSI support page, the 5700x doesn't need the same recent update.

But my BIOS is up to date so I don't understand (I checked the version on BIOS and Windows 11).



Guys I'm really lost, I don't know what to do anymore but since this should work, I don't want to give up now.



Do you have any idea ?
 
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So I load default settings but ftpm is enable in this mode so I disabled it manually. Then I flashed to 7B85v2F and tried the 5700X3D but still nothing.
So I returned to the bios and ftpm is enable again... Like the flash re-enabled it.
https://imgur.com/a/AYmNdqk
View: https://imgur.com/a/AYmNdqk

(Don’t mind about the version in 7B85v2E, I switch back to this version to test it after the F doesn’t worked).

When I put back the 3600 it displays this :
https://imgur.com/a/ZxlA9b1
View: https://imgur.com/a/ZxlA9b1
 
Upvote 0 Downvote
Similisora said:
So I load default settings but ftpm is enable in this mode so I disabled it manually. Then I flashed to 7B85v2F and tried the 5700X3D but still nothing.
So I returned to the bios and ftpm is enable again... Like the flash re-enabled it.
https://imgur.com/a/AYmNdqk
View: https://imgur.com/a/AYmNdqk

(Don’t mind about the version in 7B85v2E, I switch back to this version to test it after the F doesn’t worked).

When I put back the 3600 it displays this :
https://imgur.com/a/ZxlA9b1
View: https://imgur.com/a/ZxlA9b1
Click to expand...
When we update bios, first we go in and disable ftpm and save and exit then go back in. When we pass the new one, it activates by itself and we don't need to do anything (it's a detail that everyone should know)
 
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Similisora said:
Not sure to understand. I can install w11 with a CPU in mobo that won’t boot ? I need to boot to do this, isn’t ?
Click to expand...
I said if you have another disk that you don't need, not the one you have now (I have a suspicion that your motherboard is ''married'' to the 3600, although it's a bit difficult)Also, when you change the processor and you have a black screen, a window usually pops up in the center about the change you've made and you have to press Y, maybe you missed this and didn't do it
 
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triplex1 said:
I said if you have another disk that you don't need, not the one you have now (I have a suspicion that your motherboard is ''married'' to the 3600, although it's a bit difficult)Also, when you change the processor and you have a black screen, a window usually pops up in the center about the change you've made and you have to press Y, maybe you missed this and didn't do it
Click to expand...
No unfortunately nothing happen on my screen, as the CPU won’t post my led monitor don’t even light up.
 
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triplex1 said:
All I can say is that the problem is with the motherboard ( and the bios?)
Something else I would look at in this particular case would be the 8+4 pins of the power supply for the processor and the reason is that you go from 65 watts to 105 watts.
Click to expand...
Yes I already checked this. I have the 8 pins connected (CPU_PWR1). The 4 left (PWR2) are not used, isn’t necessary for 105W.
 
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triplex1 said:
All I can say is that the problem is with the motherboard ( and the bios?)
Something else I would look at in this particular case would be the 8+4 pins of the power supply for the processor and the reason is that you go from 65 watts to 105 watts.
Click to expand...
I agree, the problem is probably with the motherboard but which one, idk
 
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triplex1 said:
See the video from Mike , it's upgrade from 3600 to 5700x3d with msi b450 mb
Maybe Did you do something wrong
View: https://www.youtube.com/watch?v=aJR2gZFnnJ8
Click to expand...
Just saw it, I’ve done everything he did. Download the firmware on usb stick, flash the bios via m-flash, check that is bios is in right version, then put the new cpu / cooler and boot.
But on my side, CPU red light like on my video.
Driving me crazy…
 
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Similisora said:
Just saw it, I’ve done everything he did. Download the firmware on usb stick, flash the bios via m-flash, check that is bios is in right version, then put the new cpu / cooler and boot.
But on my side, CPU red light like on my video.
Driving me crazy…
Click to expand...
If you haven't given up hope, try again sometime, it's not possible for the CPU to work on another motherboard and not on yours.
If you put it in the socket with delete, don't you enter the bios?
 
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triplex1 said:
If you haven't given up hope, try again sometime, it's not possible for the CPU to work on another motherboard and not on yours.
If you put it in the socket with delete, don't you enter the bios?
Click to expand...
Just tried and no. Nothing boot at all.
I’m chatting with Mike and other guys on his discord channel to take other ideas, but nothing new for now.
 
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