Question CPU light is red at startup but system eventually POSTs, but BIOS shows no temps or fan speeds ?

[tymcpherson82]

I have a Ryzen 5700X with a B550 Tomahawk mobo that I built about 2 months ago. I recently installed an AIO and since then my CPU light is on red. The pc will eventually boot however, it takes a few minutes but seems to run fine. except for the cpu fan is going full speed.

I was able to get into the bios and it shows that my cpu temp is 0 and it looks like i dont have any fans or pumps connected. however my aio pump is connected and is definately working. Using ryzen master i see the temps and they appear to be fine. I ordered a new cpu but is the problem going to be my motherboard instead?

 

[Lutfij]

Welcome to the forums, newcomer!

Is this your motherboard;
https://www.msi.com/Motherboard/MAG-B550-TOMAHAWK
?

If so, download the latest BIOS from here;
https://www.msi.com/Motherboard/MAG-B550-TOMAHAWK/support#bios
then proceed with the steps outlined in this guide;

View: https://www.youtube.com/watch?v=eNi0Y0CFDEI


If you want to rule out your processor, you could've dropped the processor onto a known working motherboard with the appropriate BIOS version to see if you're able to get POST without a hiccup. You could conversely drop in a processor that's known working (sourced from a friend, not bought)

 

[tymcpherson82]

My pc worked fine until a week ago and when it does post it works fine . the motherboard says no fans are connected but they are all running full blast. Would i need to flash my bios. I didnt change anything.

 

[CountMike]

My pc worked fine until a week ago and when it does post it works fine . the motherboard says no fans are connected but they are all running full blast. Would i need to flash my bios. I didnt change anything.

Which AIO and what is it connected to ?

 

[beyondlogic]

I have a ryzen 5700x with a b550 tomahawk mobo that i built about 2 months ago. I recently installed an aio and since then my cpu light is on. The pc will eventually boot however it takes a few minutes but seems to run fine. except for my cpu fan is going full speed. I was able to get into the bios and it shows that my cpu temp is 0 and it looks like i dont have any fans or pumps connected. however my aio pump is connected and is definately working. Using ryzen master i see the temps and they appear to be fine. I ordered a new cpu but is the problem going to be my motherboard instead?

Make sure bios is latest version

Make sure the pump wire is connected to the appropriate pin header named pump and the wire for fans for CPU

 

[tymcpherson82]

Which AIO and what is it connected to ?

Deepcool Mystic 360