no post and cpu debug light (2nd mobo)

[sk8ter20art]

Im lost, I bought some upgrades for my wifes computer.  Assembled everything new CPU, RAM, NVME m.2, and old ssd.  powered on, got RGB everywhere, no post from gpu, or igpu. tried flashing the bios and still same issue, no post at all.  Returned that mobo thinking it was defective.  got replacement and before installing everything tried mobo only. no post, added cpu, no post.  still get rgb and cpu debug light, (no ram debug, even though ram is not installed).

 

AMD ryzen 5 5600G

MSI b450 pro carbon max wifi

2x 16gb corsair 3000mhz vengence RGB pro

samsung 970 evo plus 500gb

corsair cx550m power supply.

display connected via hdmi (works just fine on other pc)

 

mobo has 2 cpu power connectors 8pin and cpu2 4pin.

power supply has a 4+4 connector, tried both as 8pin and as 4pin.

both ways i get rgb but NO POST.

 

I should be able to get a post some way.  I havent tried much since the 2nd board has done the same as the first.

[Hachi_Roku256563]

Doesnt that Motherboard need a bios update to work with that cpu?

[sk8ter20art]

3 minutes ago, Hachi_Roku256563 said:

Doesnt that Motherboard need a bios update to work with that cpu?

I tried the bios update on the previous mobo, even with a cmos clear i still got the same CPU_debug light on the mobo.

[Hachi_Roku256563]

1 minute ago, sk8ter20art said:

I tried the bios update on the previous mobo, even with a cmos clear i still got the same CPU_debug light on the mobo.

But how would you update the bios if you cant post?
also are you sure the cpus not faulty no bent pins?

[sk8ter20art]

1 minute ago, Hachi_Roku256563 said:

But how would you update the bios if you cant post?
also are you sure the cpus not faulty no bent pins?

this mobo has the flashback bios update ability (new feature on newer motherboards) only needs power to mobo, no cpu or ram required.

[-rascal-]

@Hachi_Roku256563might be onto something.

For that motherboard, BIOS version 7B85v26, or newer, must be flashed onto the motherboard before the 5600G will be recognized.

Do you have an older CPU/APU available to perform the BIOS update?

 

Oh the motherboard, also has a 'Flash BIOS' button / feature, so you can update the BIOS without a CPU installed.

Make sure you follow the steps on how to flash the BIOS "headless" properly.

 

https://www.msi.com/Motherboard/support/B450-GAMING-PRO-CARBON-MAX-WIFI#support-cpu

 

[Hachi_Roku256563]

But is the CPU okay
No bent pins??
Have you tried another Cpu?

[sk8ter20art]

15 minutes ago, -rascal- said:

@Hachi_Roku256563might be onto something.

For that motherboard, BIOS version 7B85v26, or newer, must be flashed onto the motherboard before the 5600G will be recognized.

Do you have an older CPU/APU available to perform the BIOS update?

 

Oh the motherboard, also has a 'Flash BIOS' button / feature, so you can update the BIOS without a CPU installed.

Make sure you follow the steps on how to flash the BIOS "headless" properly.

 

https://www.msi.com/Motherboard/support/B450-GAMING-PRO-CARBON-MAX-WIFI#support-cpu

 

ok so just on a whim i tried the "not most recent" bios like i did the first time.

 

I tried the flash with 7B85v26 version of the bios. (which mentions 5000 series in the description)

power cycled the computer after the flashback bios install.

cleared the cmos

now it posts! yay, so maybe something was wrong with the latest bios, like it was a patch to a previous instead of the whole package.