Solved New CPU, CPU Debug Light On, Monitor turns on when powered on but “No Signal”

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Ricky Spanish

PCHF Member
Nov 28, 2022
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I apologize if this issue has already been resolved on this site, but I could not find one in the exact same position I am in. I have recently purchased a Ryzen 9 5950x, put it in my PC and now the motherboard has the debug CPU light on, and the fan on my motherboard is running at full speed constantly. Also, when I power on the system, my monitor turns on, but says “No Signal”. When I switched out my CPU, I did take out my GPU as well just for ease in the CPU switching process, and to clean the parts as well. Everything in the system worked fine before I switched the CPU’s. I just want to make sure that nothing is wrong with the recently purchased CPU, because I have a limited amount of days to return it if it is faulty. Thank you to anyone who can help in advance, and here is my set-up…

CPU: AMD Ryzen 9 5950x (recently upgraded from Ryzen 7 3700x)

GPU: EVGA RTX 2070 Super

Motherboard: MSI MPG X570 Gaming Pro Carbon WiFi

RAM: 16GBx2 Corsair Dominator Platinum RGB 3200MHz

Memory: 1TB SSD & 2TB HDD

PSU: Corsair RM750
 
Step 1) double check cpu is seated correctly.
Step 2) Make sure thermal paste is correct.
If above no good
Step 3) Put in old cpu - test.

Did you check if your motherboard/BIOS supports 5950x
 
I double checked to make sure it was seated correctly, and I cleaned off and re-applied thermal paste. Still did not work. I put in my 3700 and it booted up fine. My specs for my motherboard say that it is compatible with 5000 series AMD CPUs. Do you think it’s possible that I got a faulty 5950?
 
When I look on the site the version numbers are diffeent the last one was
version 7B3v1H 2022-09-01
And the one before 7B93v1F 2022-03-31 which was for Ryzen 7 5800X3D support

Before sending back
I would ask msi support if the bios needs an update
I am never one for updating a bios unless I have to
account.msi.com

MSI Member Center

account.msi.com account.msi.com
 
My guess is you need a bios update
However I would not update without confirmation.
I found this
RYZEN 9Vermeer5950X1003.4GHz8MB64MBB2105N/A7B93v1D

Which means you need BIOS Version 7B93v1D
You say your version is 1.7 but I cannot find that on the website
I am looking at this motherboard

MPG X570 GAMING PRO CARBON WIFI

Best AMD AM4 X570 ATX gaming motherboard, lightning PCIe 4.0, two lightning M.2, Frozr heatsink, Intel LAN, WiFi 6, USB 3.2 Gen 2 and Mystic Light, M.2 heatsink, powerful overclocking, pre-install I/O, MSI GAMING
www.msi.com www.msi.com


 
If I go to bios and look, it said bios version E7B93AMS.170. I found the 1.7 if I went to the control center and typed in “wmic bios get smbiosbiosversion”.
 
I’ve been thinking about the BIOS update all day and I should’ve mentioned that my I bought all of my initial PC parts (including my motherboard) in the summer of 2020. The Ryzen 9 5950x did not release until November of 2020. So it would make sense that my current BIOS version doesn’t even know what a 5950x even is. If I update my BIOS and it still does not work with the 5950x, will I be able to put my 3700x back in and it work? I don’t want to update BIOS, then be stuck with a faulty 5950x and the wrong BIOS version for the 3700x.
 
A BIOS update should just make it to take the new and the old
I have never seen one that does not work like that.
You should be able to backup your current bios and flash back if needed
 
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