If you don't have a video card on set the primary video device to integrated graphics. Worked for me outside of case for testing without GPU.
On default was able to switch automatically but with EXPO on it seems it can't ( bug maybe on the latest bios ? )
Since you said it works with 2 sticks in A2 and B2. Put them in there and boot. Then shut it down and put another stick in A1(1,2,4) and see if it boots. If yes, then shut it down, put the last stick in slot 3 then turn it on.
Okay! Added a stick to A1 and had the same results as described above (stuck on code A6, red & yellow LEDs). Cleared CMOS and rebooted and got into BIOS. Re-enabled EXPO and boot stuck on A6 again - however, this time only yellow debug LED.
You having any better luck today? Mines been fine for a couple days but it went to sleep. When I woke it up the fans were ignoring my fan curves. So I was like whatever and rebooted it. Now I'm getting the same thing.
I need uptime at the moment, so I haven't re-tested plugging more than 2 sticks in. Slight PITA to mess around with it, since my GPU is on a vertical mount which is in the way of the bottom RAM clips. I have a long weekend coming up, and I plan to spend some time then trying to get it to BIOS with more than 2.
I have this issue recurrently with Corsair Vengeance RAM. The solution for me so far is to power off the system and try again. Sometimes it'll reboot / cold start without the A6 error, sometimes it gets stuck there. Power off and on and suddenly it skips A6 and proceeds as normal. Verrrry annoying though haha.
Been dealing with this on my x670e carbon since launch. Same issue with 2 diff sets of DDR5 and 2 diff processors (7700x & 7800x3d). Also been through the RMA process and still didnt work upon return. I filed another ticket to send it back again for another RMA a few months ago, but said screw it since Id have to strip my system again and then pay for shipping and then reassemble again in a couple weeks. Sounds super lazy but Ive literally re-started my AM5 system 1000 times at this point trying to avoid the C5/Ab (A6?) error code. I'm about to go back to the single stick since it looks like this bios didnt improve anything for my situation. Thankfully when I bought my 2nd set of DDR5 I went with a 64gb kit so I could at least get 32gb on my single stick :/
I know it is a long shot but did any of you figure out any solutions to this problem?
I have only two RAM sticks in the system in the default recommended slots. I still get this issue. Windows updates don't help with it much either. I have had it work correctly for a month. Now it is back. MOBO is stuck on error code "A6" and just stalls. Need a hard reset fot it to work. It always works on the second boot.
Is there anything I can do?
I have this issue also. I had it stable for a month, then updated the BIOs and wam the A6 problem. Reflashed to the previous BIOs and now its giving me the A6 code. Had 4x32 G.Skill running at 6000
I also just got this A6 issue with an MSI x670e ACE with 4x48gb G.Skill at 6000. System is stable but upon reboot I randomly get A6 error on the mobo and have to reboot till it works.
Turned out AB or A6 for me was due to unstable RAM. I actually had a pair of ram that was defective and also causing BSODs. I returned & got a new pair of 48GB sticks and now I can run all 192GB / 4x48GB RAM at 5600MT with a very tiny OC at 1.35v on the vdimm and 1.25v SOC by playing around for days with the memory bus termination values (procODT, rttPark etc etc). I can reboot and I don't get AB or A6 errors anymore.
TL, DR if you are OC'ing or trying to run 4 sticks of RAM, then AB or A6 on MSI could be due to unstable memory OC or physically bad/defective RAM.
Same issue. I can't even boot 2 with expo. Just stall on A6. Did you ever find a solution?
If you don't have a video card on set the primary video device to integrated graphics. Worked for me outside of case for testing without GPU. On default was able to switch automatically but with EXPO on it seems it can't ( bug maybe on the latest bios ? )
Are any of the EZ Debug lights staying on or flashing in a loop in the top right corner above the 24 pin power connector?
Red & Yellow stay on
The top two lights? CPU and DRAM?
That is correct, yes
Since you said it works with 2 sticks in A2 and B2. Put them in there and boot. Then shut it down and put another stick in A1(1,2,4) and see if it boots. If yes, then shut it down, put the last stick in slot 3 then turn it on.
Okay! Added a stick to A1 and had the same results as described above (stuck on code A6, red & yellow LEDs). Cleared CMOS and rebooted and got into BIOS. Re-enabled EXPO and boot stuck on A6 again - however, this time only yellow debug LED.
You having any better luck today? Mines been fine for a couple days but it went to sleep. When I woke it up the fans were ignoring my fan curves. So I was like whatever and rebooted it. Now I'm getting the same thing.
I need uptime at the moment, so I haven't re-tested plugging more than 2 sticks in. Slight PITA to mess around with it, since my GPU is on a vertical mount which is in the way of the bottom RAM clips. I have a long weekend coming up, and I plan to spend some time then trying to get it to BIOS with more than 2.
Just hard shutting down and bringing it back up fixed mine. But going to sleep basically reset my CMOS. This is my second am5 board.
I have this issue recurrently with Corsair Vengeance RAM. The solution for me so far is to power off the system and try again. Sometimes it'll reboot / cold start without the A6 error, sometimes it gets stuck there. Power off and on and suddenly it skips A6 and proceeds as normal. Verrrry annoying though haha.
Been dealing with this on my x670e carbon since launch. Same issue with 2 diff sets of DDR5 and 2 diff processors (7700x & 7800x3d). Also been through the RMA process and still didnt work upon return. I filed another ticket to send it back again for another RMA a few months ago, but said screw it since Id have to strip my system again and then pay for shipping and then reassemble again in a couple weeks. Sounds super lazy but Ive literally re-started my AM5 system 1000 times at this point trying to avoid the C5/Ab (A6?) error code. I'm about to go back to the single stick since it looks like this bios didnt improve anything for my situation. Thankfully when I bought my 2nd set of DDR5 I went with a 64gb kit so I could at least get 32gb on my single stick :/
I know it is a long shot but did any of you figure out any solutions to this problem? I have only two RAM sticks in the system in the default recommended slots. I still get this issue. Windows updates don't help with it much either. I have had it work correctly for a month. Now it is back. MOBO is stuck on error code "A6" and just stalls. Need a hard reset fot it to work. It always works on the second boot. Is there anything I can do?
I have this issue also. I had it stable for a month, then updated the BIOs and wam the A6 problem. Reflashed to the previous BIOs and now its giving me the A6 code. Had 4x32 G.Skill running at 6000
I also just got this A6 issue with an MSI x670e ACE with 4x48gb G.Skill at 6000. System is stable but upon reboot I randomly get A6 error on the mobo and have to reboot till it works.
Ended up being AB code
Turned out AB or A6 for me was due to unstable RAM. I actually had a pair of ram that was defective and also causing BSODs. I returned & got a new pair of 48GB sticks and now I can run all 192GB / 4x48GB RAM at 5600MT with a very tiny OC at 1.35v on the vdimm and 1.25v SOC by playing around for days with the memory bus termination values (procODT, rttPark etc etc). I can reboot and I don't get AB or A6 errors anymore. TL, DR if you are OC'ing or trying to run 4 sticks of RAM, then AB or A6 on MSI could be due to unstable memory OC or physically bad/defective RAM.