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MSI B450 motherboard will only take memory in slots A2 & B2

Hi everyone!

 

So I have a "new" rig that has a MSI Tomahawk Max B450 with a Ryzen 7 3700X CPU. I'm using 2 new sticks of Corsair Vengeance RGB. The problem that I'm having is that the system won't POST with the memory in slots A1/B1, however, it will POST with the ram in B1/B2. 

 

To clarify, when I say the the system "won't POST", the system will power up and the lighting on the memory turns on, but it hangs there without the monitor coming on.

 

Am I doing something wrong or do I have a problem with the motherboard?

 

Thanks!

 

zog

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That board should have some sort of debug leds, what do they say on no boot.

I could use some help with this!

please, pm me if you would like to contribute to my gpu bios database (includes overclocking bios, stock bios, and upgrades to gpus via modding)

Bios database

My beautiful, but not that powerful, main PC:

prior build:

Spoiler

 

 

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Page five, or more details on page 28, it's in the manual. https://download.msi.com/archive/mnu_exe/mb/E7C02v3.1.pdf

Humor me, as you should do.

 

Daily drivers, below.

 

Diccbudd PC

Intel Xeon E3-1225 v2 3.2 GHz 4C/4T CPU || ASRock B75M Motherboard || Team Group 2x4 GB DDR3 1600 MHz RAM || 480 GB Pioneer APS-SL3 SATA SSD // 1 TB Seagate 2.5" HDD || be quiet! System Power 9 500W PSU || Cooler Master T20 CPU Cooler || Samsung S19D300 + LG L177WSB Monitors || Fantech X6 Knight Mouse || VortexSeries VX7 Pro Keyboard

 

Acer Aspire 4253, runs as NAS 24/7

AMD E-350 1.6 GHz 2C/2T CPU || 3 GB DDR3 1066 MHz RAM || 1 TB HDD for whole family movie pleasure

 

Xiaomi Redmi Note 8

4GB RAM, 64GB Internal Storage  || 64GB SanDisk Ultra (80MB/s Read) External Storage || Resurrection Remix Custom ROM

 

Audio

Some random 2.1 home-theater speakers with old computer speaker amplifier. It sounds good af tho. || dbE DJ100 Headphone || Rock Space Obsidian Earphone || JCALLY JM6 CX31933 DAC

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@dhannemon13 Thanks, not sure how I missed that, kinda obvious when you take a second look.

 

Side question, does anyone know why MSI setup the memory on the board this way?

 

Thanks for the advice and (ahem) being gentle about RTFM!

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21 minutes ago, zogthegreat said:

@dhannemon13 Thanks, not sure how I missed that, kinda obvious when you take a second look.

 

Side question, does anyone know why MSI setup the memory on the board this way?

 

Thanks for the advice and (ahem) being gentle about RTFM!

Fun fact: I actually did stuck on why didn't my brother's B350M boot. Turns out, wrong slot. Put it on A1 and B1. 

 

Well, we really should RTFM for the things we curious into.

 

And, actually made me curious enough to searching about this. Good to know tho, never knew why we should either until I read this.

 

https://forums.tomshardware.com/threads/why-are-we-putting-ram-sticks-into-2nd-and-4th-slot-first.3195865/

Humor me, as you should do.

 

Daily drivers, below.

 

Diccbudd PC

Intel Xeon E3-1225 v2 3.2 GHz 4C/4T CPU || ASRock B75M Motherboard || Team Group 2x4 GB DDR3 1600 MHz RAM || 480 GB Pioneer APS-SL3 SATA SSD // 1 TB Seagate 2.5" HDD || be quiet! System Power 9 500W PSU || Cooler Master T20 CPU Cooler || Samsung S19D300 + LG L177WSB Monitors || Fantech X6 Knight Mouse || VortexSeries VX7 Pro Keyboard

 

Acer Aspire 4253, runs as NAS 24/7

AMD E-350 1.6 GHz 2C/2T CPU || 3 GB DDR3 1066 MHz RAM || 1 TB HDD for whole family movie pleasure

 

Xiaomi Redmi Note 8

4GB RAM, 64GB Internal Storage  || 64GB SanDisk Ultra (80MB/s Read) External Storage || Resurrection Remix Custom ROM

 

Audio

Some random 2.1 home-theater speakers with old computer speaker amplifier. It sounds good af tho. || dbE DJ100 Headphone || Rock Space Obsidian Earphone || JCALLY JM6 CX31933 DAC

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