Z390 Pro Carbon -- only Channel B DIMM slots work

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Sep 19, 2020
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I recently purchased an MSI MPG Z390 Gaming PRO Carbon MB as part of a new PC build.

Memory purchased is 16 GB (2X8GB) Corsair Vengeance RGB Pro DD4 (selected using PC Picker compatibility/build site).

The issue...I can get 1 8GB stick to work fine in slot B2 (boots in to Windows 10). If I put it in slot B1, it boots up eventually with error on screen about using wrong slot and then goes in to the Windows OS fine. If I put 1 stick in either A1 or A2, nothing happens...never reach option to enter BIOS screen. If -- as recommended, I put a stick in slot B2 and one in A2, no boot up at all. If I put DIMM sticks in B1 & B2, it doesn't boot up.

I've verified, both DIMMs work fine in slot B2 so I'm pretty confident it is not a memory issue.

I updated BIOS to June 2020 version (which talks about improving memory compatibility)...still not working correctly.

I removed power cord and CMOS battery for an hour and re-connected...and still nothing.

Am I missing something basic? Or is there other troubleshooting steps I can take?

thanks in advance for the assist...matt
 

citay

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Oct 12, 2016
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Reseat the CPU, and while it's out, inspect the socket for any bent pins. This kind of stuff can happen when one or more pins don't have contact, as the memory controller is inside the CPU. The mainboard is actually just providing the RAM sockets and the PCB traces coming there from the CPU socket. The CPU does all the action.
 
Joined
Sep 19, 2020
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Reseat the CPU, and while it's out, inspect the socket for any bent pins. This kind of stuff can happen when one or more pins don't have contact, as the memory controller is inside the CPU. The mainboard is actually just providing the RAM sockets and the PCB traces coming there from the CPU socket. The CPU does all the action.
Great point... I took a look, pins look good to me. Though...looking at attached pic, inside left side...should it look that way?

Thoughts?
 

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darkhawk

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The picture is really poor quality. Hard to even say if anything is wrong for certain.
Honestly, I'm guessing that all those pins are bent, and they probably go to the memory sockets A1 and A2, which is why they aren't working.
You'll need to get a different motherboard if you want to get it working right most likely.
 

flyingv2815b702e7

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Aug 14, 2020
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Yeah, the pins are bent, the socket is bad.

Since you've got nothing to lose, you can try to straighten them with the razor blade technique.
This works better on CPUs not sockets but the premise is that your going to use a very thin
piece of metal to slide in between the rows and in the process unbend the pins. You limit the
area being worked on to just the damaged area. Last time I did this it was a CPU not a socket
and pin spacing wasnt as tight as it is now.

Since your damage is at the edge, it should be an easier job than if they were in the middle.
If you feel like the pins are too tiny, too close together, or your worried you might ruin it further,
then don't attempt it.
 

dirtyolba154a02e3

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Sep 19, 2020
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The picture is really poor quality. Hard to even say if anything is wrong for certain.
Honestly, I'm guessing that all those pins are bent, and they probably go to the memory sockets A1 and A2, which is why they aren't working.
You'll need to get a different motherboard if you want to get it working right most likely.
I’m with Darkhawk, the pins don’t look right. Whoever did the install jacked it up.
 
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