ASUS ROG Maximus Z690 Extreme - Q-Code 55 (Memory Not Installed)

[Kifoune007]

Hello all,

Just finished my build with a double water-cooling (CPU & GPU) system on a Thermaltake Tower 900.

I have a no POST no SCREEN with a Q-CODE error 55

I'm running an ASUS ROG Maximus Z690 Extreme motherboard with an i9-13900K installed.

I bought a kit of CORSAIR Dominator Platinum RGB 32Go (2x16Go) DDR5 DRAM 6200 MHz C36 (6200 MT/s) => Exact Ref :  cmt32gx5m2x6200c36

When I look at the ASUS QVL those RAM are said to be compatible.

When I look at the CORSAIR site those RAM are NOT said to be compatible.

i9-13900K is supposed to run up to 5600MT/s. Those RAM CORSAIR are running 6200MT/s native.

Could it be this ? Or other causes ?

I would be very keen on exchanging with some of you on this topic as I can't at this stage even start the BIOS...

Thanks in advance !

Cheers

[Nate152]

Hello Kifoune007

Check you have your memory installed in the A2-B2 slots (2nd and 4th slots from the cpu).

With your pc powered off, press and hold the clear cmos button for 3 seconds.

Try booting up.

[Kifoune007]

Thanks.

Done but no way…

Still have a-code 55 error

[Nate152]

Sorry to hear that didn't work.

If this is you're memory kit, it should work. It's listed for Intel 600 and 700 series motherboards.

DOMINATOR® PLATINUM RGB 32GB (2x16GB) DDR5 DRAM 6200MHz C36 Memory Kit — Black (corsair.com)

So...

For good measure, you could try updating the bios with the bios flashback feature. You'll need a usb flash drive and access to another pc to download and rename the bios file. If you need help with this, just say so.

What I suspect is either your cpu water block is a little too tight, pushing some pins out of align or warping the cpu, or you have some bent cpu socket pins.

Try loosening the mounting screws of the cpu water block a little, make sure the mounting screws are just snug.

[Kifoune007]

• Thank you.
• I will try to do so at the end of this week, being abroad from home in the mean time…

[Nate152]

You're welcome.

Not a problem, give us an update anytime.

[1TM1TM]

Code 55 (used to be) memory. Try 1 stick only - in each of 4 sockets. Then the other stick. If both work in some slot, then follow @Nate152 's suggestion to loosen or re-seat the CPU as likely not all leafs making a contact with the CPU. If re-seating (or cleaning) the CPU contacts doesn't help it's likely the board (may need to replace or RMA it). Do not clean or do not touch the leafs in the CPU socket. Only the CPU.

Also try: HDMI cable to get video output from board to monitor (or to a TV) to see the BIOS screen. Make sure either monitor or TV set to HDMI input. If you use display port - try that from board to monitor.

6200-36 is likely to be Samsung (some QVL lists indicate whether the used chips are Micron or Samsung or Hynix) - BIOS does too, but you need to start BIOS first to see that info. Hynix is best for DDR5; Samsung not so good.

BIOS reset should default memory speed to 5600 (or to 4800) - so read manual to find the BIOS reset button or pins.

[Kifoune007]

Thanks 1TM1TM.

I will try one by one but I'm pretty sure this will not change anything (tried 3 upon 4 on both).
I will update the BIOS also through flashback and then proceed with CPU verification (even if I have to drain everything and it's damned heavy to do). I should have fixed that before filling...

Anyway, will keep you posted this end of the week.

Thank again guys.

[Nate152 · Accepted solution]

Sounds good.

Yeah, I'm hoping we can get you going without having to drain your loop.

I also did a build in the Tower 900, I have the ROG Strix Z690-F Gaming Wifi with the 12700KF.

My cpu water block is the EK Quantum Velocity2, EK recommends using their torque screwdriver for installation.

Just wondering if you went this cpu water block and used the torque screwdriver.  

[Kifoune007]

Exact same water block EK.

Didn't used the torque screwdriver...
Hope not having destroyed the CPU by error (don't remember putting a lot of force either but..)