Starting a post for some help with a detect memory issue I can't seem to solve.
Problem: Can't get past POST, persistently get Qcode 28, 54 and then hang on 55. Using latest (0904) Bios while writing this. Have swapped out RAM from my original kit (F5-6000J3040G32GX2-RS5K) to (F5-6800J3446F48GX2-TZ5RK) as I initally thought it was faulty after remounting everything and trying all slots whilst isolating ram sticks. I have checked all pins and PCB tracks (specifically the ones to the right of the CPU around the mounting holes. No RAM slots provide a successful boot whether I use 1 or 2 sticks. I have tried rolling back BIOS and cycled between chips 1 and 2. I have tried safe boot, battery out, 60s CMOS hold reset, loosening CPU cooler mount screws, loosening Backplate screws and gradual tightening again whilst periodically clearing CMOS and booting.
RAM is always checked and checked again for a firm and correct seating.
MB: Maximus Z790 Extreme (0904)
GPU: Strix 4090
PSU: Be Quiet Dark Power Pro 1200
Cooling: CPU block Heatkiller IV with LGA1700 Heavy Backplate and washer mod (0.8mm), Heatkiller V Pro 4090 Strix
I'm running out of ideas. I appreciate the help, thank you.
Does this behaviour occur directly after clearing the UEFI via the button on the motherboard's rear IO port?
When removing the CPU did you check the socket pins?
You may want to remove the board from the chassis and retest. Q-CODE 55 is memory detect, which would imply either a fault or mount issue.
Hi Mate, thank you for the reply. Regardless of a CMOS prolonged reset (60s), unplugged and battery out it hangs on QCode 55 after cycling 28 and 54. this occurs straight after powering on, both safe boot and using the front case button. All pins, PCB tracks (particularly around mount holes on right side of CPU) and RAM slots have been meticulously inspected for no damage. All components have been pulled out and reinstalled. Mounting is firm but not overkill, have loosed and rechecked.
Are both those 8 pin CPU connections secure?
Hi Hopper64, Yeah both connectors top right and the single 8 pin beside the MB 24 pin. I'm really wondering what it could be.. At least with this replacement RAM Kit in have the RGB to go off also, even though there could be an issue present without the lights. I've also checked for a beta BIOS newer than 0904. I mean I cant even get to the GUI, it hangs only a couple seconds after powering on. As I said, 28, 54 and then stops with 55. Thanks for the suggestion 🙂
Hi again Silent_Scone! With my reply to Hopper64, I will attempt a CPU swap and then a board RMA. If I follow the latter, which board would offer similar performance. I looked at the previous gen Z690 extreme, my RAM however would then be incompatible (F5-6800J3446F48GX2-TZ5RK). Usage includes, moderate overclocking, gaming and some trans-coding.
Not sure if its the same issue, I couldn't get 2x32 to work unless I under clocked the memory. Kind of defeats the purpose. I just went with F5-7800J3646H16GX2-TZ5RK also on 0904. I can run with XMPII running rock solid. If you can get 2x16 and it works great, if it doesn't may me a board issue.
Yea. That was my only other thought. Have you tried a different memory kit altogether? Maybe one not so dense as in 32G in total? I had the same error code and had to RMA my extreme board but I tested it extensively. I had the advantage of several memory kits lying around so it was no problem to try a different kit altogether.
Hi again Hopper! I have indeed tried a different kit and the RGB is illuminating so thats a good sign but taken with a grain of salt. Thing is, I cant see any discernible damage to the board so I've opted for a CPU replacement (possible faulty IMC) if that turns up negative then I'll RMA the board entirely.... Pity its EOL.