[SOLVED] one of my dimm slots doesn't work anymore

[sadgpunoise]

I have 2 memory sticks, both are 8gb 2400mhz and I only have 2 dimm slots on my motherboard.
After installing a new PSU today slot A stopped working.
I've tried every available combination and the only one that works is putting one stick in slot B.
Both memory sticks work individually.
Is there a way to fix it?

 

[Ralston18]

Update your post to include full system hardware specs and OS.

Old PSU, new PSU: make, model, wattage, age, condition?

What was the original reason for replacing the PSU?

If the old PSU was working and is still available then reinstall and determine if both dimm slots work again.

 

[sadgpunoise]

Update: now i'm able to install on both dimm slots, but the PC recognizes only on of them. in the bios it recognizes both but in windows it only uses one.

 

[sadgpunoise]

Update your post to include full system hardware specs and OS.

Old PSU, new PSU: make, model, wattage, age, condition?

What was the original reason for replacing the PSU?

If the old PSU was working and is still available then reinstall and determine if both dimm slots work again.

Specs:
Windows 10 Pro 64-bit
Intel Core i5 7400 @ 3.00GHz 41 °C
Kaby Lake 14nm Technology
RAM
16.0GB Dual-Channel Unknown @ 1197MHz (17-17-17-39)
Motherboard
ASUSTeK COMPUTER INC. H110M-K (LGA1151) 117 °C
Graphics
SyncMaster (1680x1050@59Hz)
4095MB NVIDIA GeForce GTX 1050 Ti (CardExpert Technology) 41 °C

Old PSU: ippon 450w (no model found)
"new" PSU: fsp hyper s 600w (it is several years old and might be the reason for the problem)
reason for replacing: i need an 8pin cable for an upcoming gpu that i ordered yesterday from newegg. the other PSU only has a 6pin connector.
Update (avoid last written update): both dimm slots work and both ram sticks work, but only individually.

 

[Ralston18]

Motherboard User Manual:

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/H110M-K/E10950_H110M-K_UM_WEB_only.pdf

Verify that I found the correct User Manual. Also look for updated information on any referenced websites.

Double check the RAM specs, installation and configuration. Pages iv and 1-8
Ensure that you have a matched set of RAM modules.

Failing the above, take a closer look at the BIOS:

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/B250M-BASALT/E13571_BIOS_Update_EM_V4_WEB.pdf

 

[sadgpunoise]

Motherboard User Manual:

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/H110M-K/E10950_H110M-K_UM_WEB_only.pdf

Verify that I found the correct User Manual. Also look for updated information on any referenced websites.

Double check the RAM specs, installation and configuration. Pages iv and 1-8
Ensure that you have a matched set of RAM modules.

Failing the above, take a closer look at the BIOS:

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/B250M-BASALT/E13571_BIOS_Update_EM_V4_WEB.pdf

Thank you so much man! it worked immediately after updating the bios!
I was ready to sell one of the sticks but thanks to you I will not need to.