Question First ram slot isn't working/mobo ain't able to detect the first ram slot!

[Devielord]

Hello everyone out there, after trying so many feasible solutions but in vain; writing the problem here in brief-
I was using my pc with single ram slot, yesterday i just bought a rak and installed it in another slot but the mobo couldn't recognize the ram!
Tried feasible solutions-

1. Bios reset
2. Bios update
3. Switching rams

Point to be noted, my mobo model is gigabyte h110m-ds2v-cf and it's 2nd slot just works with one ram (afaik) whenever i've installed the second ram in the first slot, pc just reboots as indicating that ram slot has some issue!

Two rams bus speed is identical just the newer ones space is 4GB more than the oldest ones!

Any solution regarding this problem?

 

[Mtop]

What happens with old ram in slot 1?
Windows version 32 or 64 bit?
DDR3 or DDR4, what did you have (#'s please) and what did you add?
https://download.gigabyte.com/FileList/Manual/mb_manual_ga-h110m-ds2v(ddr3)_e.pdf

 

[Devielord]

What happens with old ram in slot 1?
Windows version 32 or 64 bit?
DDR3 or DDR4, what did you have (#'s please) and what did you add?
https://download.gigabyte.com/FileList/Manual/mb_manual_ga-h

What happens with old ram in slot 1?
Windows version 32 or 64 bit?
DDR3 or DDR4, what did you have (#'s please) and what did you add?
https://download.gigabyte.com/FileList/Manual/mb_manual_ga-h110m-ds2v(ddr3)_e.pdf

DDR4, 64 bit
Read the manual several times and no solutions found

 

[scout_03]

give full name and model of both ram stick .

 

[Devielord]

give full name and model of both ram stick .

Team elite plus 8GB 2400 MHz (using this one in the second slot, first slot is empty as it doesn't support any ram)
Another ram is apacer 4GB 2400 MHz (it's out of the pc, reason has been mentioned above)

 

[scout_03]

that is only maker name add to this the model of each also ram mixing is not very good for system .

 

[Devielord]

model also been added, adding below again-
8GB module of team elite plus, 2400 MHz
4GB module of apacer, 2400 MHz
Mixed different maker's ram because there's no apacer 8GB identical MHz (2400) in my area