MSI B450-A Pro Max won't boot with 2 DIMMS in dual channel

wejda153302dc

New member
Joined
Jan 21, 2021
Messages
6
Just built this machine. It fails to boot with 2 sticks of RAM (DRAM LED indicator stays on), but works fine with just one stick of RAM. When I use two sticks, they are inserted into DIMMA2 and DIMMB2 slots as per manual. Both sticks work fine on their own, but won't boot when paired.

What I have done so far:
- I have checked the compatibility lists and my memory sticks seem to be compatible with the motherboard
- I have tried switching the memory sticks back and forth between DIMMA2 and DIMMB2 slots with no results
- I have tried booting with just one memory stick. Either stick works fine in this mode. The LEDs go all the way from CPU to BIOS, then they go out and BIOS boots.
- I have tried resetting CMOS with no results
- I have updated BIOS to the latest available version (E7B86AMS.M60) with no results
- I have manually specified the speed and voltage of my memory sticks with no results

I'm open to any and all suggestions and I am out of ideas.

Board: MSI B450-A Pro Max
BIOS: E7B86AMS.M60
VGA: Sapphire Pulse Radeon RX 5700 XT 8GB RTL
PSU: Cooler Master MWE White Series 600 W
CPU: AMD Ryzen 5 3600
Memory: Patriot Viper 4 DDR4 16GB (2x8GB) 3200MHz CL16
Cooler: Arctic Freezer 7X CPU Cooler 92mm
HDD/SSD: None (will be transferred from older PC)
OS: None
 

Alan J T

GRUMPY OLD FART
Joined
Sep 11, 2020
Messages
2,587
Try B1 and A1 slots.
Just built this machine. It fails to boot with 2 sticks of RAM (DRAM LED indicator stays on), but works fine with just one stick of RAM. When I use two sticks, they are inserted into DIMMA2 and DIMMB2 slots as per manual. Both sticks work fine on their own, but won't boot when paired.

What I have done so far:
- I have checked the compatibility lists and my memory sticks seem to be compatible with the motherboard
- I have tried switching the memory sticks back and forth between DIMMA2 and DIMMB2 slots with no results
- I have tried booting with just one memory stick. Either stick works fine in this mode. The LEDs go all the way from CPU to BIOS, then they go out and BIOS boots.
- I have tried resetting CMOS with no results
- I have updated BIOS to the latest available version (E7B86AMS.M60) with no results
- I have manually specified the speed and voltage of my memory sticks with no results

I'm open to any and all suggestions and I am out of ideas.

Board: MSI B450-A Pro Max
BIOS: E7B86AMS.M60
VGA: Sapphire Pulse Radeon RX 5700 XT 8GB RTL
PSU: Cooler Master MWE White Series 600 W
CPU: AMD Ryzen 5 3600
Memory: Patriot Viper 4 DDR4 16GB (2x8GB) 3200MHz CL16
Cooler: Arctic Freezer 7X CPU Cooler 92mm
HDD/SSD: None (will be transferred from older PC)
OS: None
 

teletubby_po

To infinity and beyond.
FIRST LIEUTENANT
Joined
Apr 6, 2020
Messages
664
- Check if there are any scratches around memory lanes
- Clear CMOS
- Clean memory golden finger
- Insert the memory module to different slot like @Alan J T suggested (A1, A2/B1, B2 or other combination)
 

wejda153302dc

New member
Joined
Jan 21, 2021
Messages
6
Thanks for your suggestions.
The memory lanes look OK. The golden finger is clean, the sticks are brand new, out of the box.

I tried inserting modules in different slots with the following results:
A1 – go
A2 – go
B1 – no go
B2 – no go
A1 A2 – go (except for BIOS giving a warning of unoptimized use)
A1 B1 – no go
A2 B2 – no go
B1 B2 – no go
 

Alan J T

GRUMPY OLD FART
Joined
Sep 11, 2020
Messages
2,587
Thanks for your suggestions.
The memory lanes look OK. The golden finger is clean, the sticks are brand new, out of the box.

I tried inserting modules in different slots with the following results:
A1 – go
A2 – go
B1 – no go
B2 – no go
A1 A2 – go (except for BIOS giving a warning of unoptimized use)
A1 B1 – no go
A2 B2 – no go
B1 B2 – no go
Humm not good so did you buy from Online or in a store as Looks like your Mother board may be DOA. will need to be exchanged
 

wejda153302dc

New member
Joined
Jan 21, 2021
Messages
6
I bought it online from a local retailer. I'm still waiting for an oppinion from the MSI support, but I guess, I'll just have to try to get a replacement in the end.
 

wejda153302dc

New member
Joined
Jan 21, 2021
Messages
6
Seems like the motherboard wasn't faulty after all. I just solved the problem by loosening the screws of the CPU cooler. I had come across this idea in multiple forums, where it was suggested that if too tight in a corner or side it can throw the memory controller off. I had tried loosening the screws with not results, but now as a measure of last resort I loosened them almost to the point where they barely hold the cooler in place, and behold, the machine booted with ram sticks in slots A2 B2!
Hope this will be of any help for anyone in the future and thanks again for all the suggestions.
 

Alan J T

GRUMPY OLD FART
Joined
Sep 11, 2020
Messages
2,587
Seems like the motherboard wasn't faulty after all. I just solved the problem by loosening the screws of the CPU cooler. I had come across this idea in multiple forums, where it was suggested that if too tight in a corner or side it can throw the memory controller off. I had tried loosening the screws with not results, but now as a measure of last resort I loosened them almost to the point where they barely hold the cooler in place, and behold, the machine booted with ram sticks in slots A2 B2!
Hope this will be of any help for anyone in the future and thanks again for all the suggestions.
waht.jpg
 
Joined
Jan 7, 2021
Messages
33
Seems like the motherboard wasn't faulty after all. I just solved the problem by loosening the screws of the CPU cooler. I had come across this idea in multiple forums, where it was suggested that if too tight in a corner or side it can throw the memory controller off. I had tried loosening the screws with not results, but now as a measure of last resort I loosened them almost to the point where they barely hold the cooler in place, and behold, the machine booted with ram sticks in slots A2 B2!
Hope this will be of any help for anyone in the future and thanks again for all the suggestions.
Hey m8. How loose is the cooler, can you twist it left and right?
 
Joined
Jan 7, 2021
Messages
33
The cooler sits quite tight even if I try to wiggle it gently. The screws are tightened just that.
Okay, if contact is good and temps are acceptable then that's good.
Out of curiosity which cooler are you running?
Sorry, I see in your sig ..... Cooler: Arctic Freezer 7X CPU Cooler 92mm
Like this one.
The screws you refer to are the original motherboard backplate mount screws and not the cooler screws?
 
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