Completely stumped (B550 Tomahawk)

goober123315bb02ed

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I've built my own PCs in the past and never had any issues, however, I for the life of me can't figure out what's wrong with my latest build I built for my brother.
specs:
MOBO: MSI MAG B550 TOMAHAWK
CPU: AMD Ryzen 5 5600g
RAM: TEAMGROUP T-Force Delta RGB DDR4 16GB (2x8GB) 3200MHz (PC4-25600)
PSU: EVGA 110-BQ-0500-K1, 500 Bq, 80+ Bronze 500W Power Supply
SSD: SAMSUNG 970 EVO Plus SSD 500GB - M.2 NVMe Interface

I decided to go with the Ryzen 5 5600g since my brother doesn't play games so he doesn't need a dedicated GPU (and the current GPU prices are still outrageous).

These are the parts I have (plus case but didn't think I'd need to list it). Before buying, I knew the Ryzen 5 5600g is a very new CPU and would need to have it's bios updated in order for it to be compatible with the MSI b550 tomahawk. I flashed it myself using a 8gb fat32 USB stick, renaming the BIOS file to MSI.ROM, leaving it in the root of the USB, and only having the mobo and PSU connected. The red flash light blinked for 4-5min then stopped, I turned off the machine and finished the build. After plugging everything in I hit the power button on the case, all the fans will start spinning and the LED lights including the ones on the mobos chipset heatsink will be on, however I get no signal on my monitor and the debug light for the CPU lights up red on the mobo. So I figured I must have failed doing the flash even though I was extremely careful and did everything step by step. I decided to take the mobo to my local computer store and asked them to update the BIOS for me, he flashed it just like I did, the same thing happened with the flash light blinking for 4-5min then it stopped. Thankfully he had an old ryzen CPU and GPU available so he put them in the PC to turn it on after he flashed it. Low and behold the pc started up and he was on the BIOS screen, I had him check to make sure the BIOS revision was the latest and it was. This showed me the mobo works and maybe I just flashed it wrong and now that he did it the correct way it will work. I got home and put all my parts back in and nothing changed, the red CPU debug light comes on on the mobo and I have no signal on the monitor. So I thought maybe the CPU is bad, I RMAed it and got a new one, and absolutely nothing changed, no signal still and the debug CPU light still turns on.

I'm at a loss at what to do at this point, as far as I can tell the mobo should be fine, it worked at the computer shop and showed it was updated to the latest BIOS so I assume the flash did work? meaning it should be compatible with the Ryzen 5 5600g CPU, however no matter what I seem to do it will not work with the Ryzen 5 5600g CPU. I've tried removing the SSD, RAM sticks, all kinds of stuff and nothing has worked. If anyone has any clue what the problem could possibly be and is willing to help that would be great, thanks.
 

eqwebbie_with_PC

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Aug 22, 2020
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856
Hi,
the mobo has HDMI and DP output. I would try the other output you did not use before, as it sometimes seems like sheer luck on which output port the BIOS screen is displayed initially.
Both mobo and monitor have to support the same HDMI or DP version; so this can be a real pain to figure out.

If this does not work, I suggest an additional CMOS reset.
Good luck!
 

goober123315bb02ed

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Jan 23, 2022
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Hi,
the mobo has HDMI and DP output. I would try the other output you did not use before, as it sometimes seems like sheer luck on which output port the BIOS screen is displayed initially.
Both mobo and monitor have to support the same HDMI or DP version; so this can be a real pain to figure out.

If this does not work, I suggest an additional CMOS reset.
Good luck!
Thanks for your reply, I appreciate it.
I've tried both the DP and HDMI output and had no luck with either unfortunately, I just went and tried both again and still nothing. I even tried on 2 different monitors that both work on other PCs, still no signal.
I reset the CMOS and that also didn't change anything sadly.
If i plug in a mouse and keyboard the mouse will have power but the keyboard seems to be completely dead regardless of which USB port I plug it into, even though it works on other PCs.
 

Alan J T

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Thanks for your reply, I appreciate it.
I've tried both the DP and HDMI output and had no luck with either unfortunately, I just went and tried both again and still nothing. I even tried on 2 different monitors that both work on other PCs, still no signal.
I reset the CMOS and that also didn't change anything sadly.
If i plug in a mouse and keyboard the mouse will have power but the keyboard seems to be completely dead regardless of which USB port I plug it into, even though it works on other PCs.
May be your ram remove one stick and try to post you may have to try it with each ram stick one at a time if one is faulty or if one of the ram slots is faulty.
One way to test is remove ram and turn on PC and if post gets past CPU and stops on ram it is a likely a Ram problem

Also can your try a older BIOS this one will still work with you CPU Bios Version 7C91vA7
 

citay

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Do you have the ability to test with a different PSU? Yours is a budget model from EVGA with less-than-stellar test results, and maybe the 5600G is more of a "diva" in regards to the output voltage quality. I know it's quite far-fetched, but if you have a different PSU to try with, it shouldn't cost too much time to test it. Just connect the cables on the fly, no need to install the other PSU in the case.
 

goober123315bb02ed

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May be your ram remove one stick and try to post you may have to try it with each ram stick one at a time if one is faulty or if one of the ram slots is faulty.
One way to test is remove ram and turn on PC and if post gets past CPU and stops on ram it is a likely a Ram problem

Also can your try a older BIOS this one will still work with you CPU Bios Version 7C91vA7
I did what you said and removed all the RAM and tried turning it on, this time the debug light was off for the CPU and it was on for the RAM. I then tried a single RAM stick and it still didn't work, I tried the other RAM stick and it worked.... I can't thank you enough for the suggestion. Seems one of the RAM sticks was bad and the CPU debug light was throwing me off making me think it was the CPU or the MOBO not being updated. I'm 1 RAM stick short but I got it up and running now, installed windows and everything, I can't thank you enough! Thanks so much!
 

citay

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Did you try both modules in the same slot, or different ones? Can you try the supposedly bad stick in another board, for example your own?
 

dch4154502d9

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There have been numerous reports of the same issue when pairing the 5600G CPU with a B550 motherboard. Not only with MSI boards but ones from other manufacturers as well. It seems to be hit or miss if it will work with the odds strongly on the side of miss. The other AMD boards, the A520 and X570, seem to work fine. Everything will say they are compatible but that often does not seem to be the case. You could be running into this issue for which there doesn't seem to be a fix as yet.
 

Alan J T

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There have been numerous reports of the same issue when pairing the 5600G CPU with a B550 motherboard. Not only with MSI boards but ones from other manufacturers as well. It seems to be hit or miss if it will work with the odds strongly on the side of miss. The other AMD boards, the A520 and X570, seem to work fine. Everything will say they are compatible but that often does not seem to be the case. You could be running into this issue for which there doesn't seem to be a fix as yet.
If that was the case there would be a flood of complaints not just one or two a day system integrators would be pitching a frigging fit.
 

Alan J T

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I did what you said and removed all the RAM and tried turning it on, this time the debug light was off for the CPU and it was on for the RAM. I then tried a single RAM stick and it still didn't work, I tried the other RAM stick and it worked.... I can't thank you enough for the suggestion. Seems one of the RAM sticks was bad and the CPU debug light was throwing me off making me think it was the CPU or the MOBO not being updated. I'm 1 RAM stick short but I got it up and running now, installed windows and everything, I can't thank you enough! Thanks so much!
Good to see you found the problem
thumb up.gif
 

dch4154502d9

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Good you got it working but my statement still stands. Just look it up. There have been many issues with that CPU / chipset combination.
 

citay

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I don't consider the problem truly solved until it can be proven that one module is indeed defective. This depends on how he tested it (which slots he used) and if the module also doesn't work in a different PC. Or if it all works fine with a different kit of RAM on this board.
 
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