Question Pc wont show display when upgrading ram(urgent)

[Iamstrugglingplshelp]

so i have a h81m-e motherboard with 4 gigs of ram i want to upgrade so i bought a 8 gig stick to go with my 4 gigs i know its not the best but I will replace 4 gigs with another 8 gigs in the future so its better upgradability. ANyway both ram slots work but when i put in the new ram stick my pc turns on but doesnt show display and its not my monitors fault because when i boot with just my old ram it works. i tried booting with only the new ram that didnt work either. The ram is hyper x ddr3 1600mhz 1.5v 1x8gig i checked and it was in the recommended list for my mother board any idea why it is not working.?? one thing to note is that my bios hasnt been updated since 2015... Im not sure updating it will help but if u think it will pls advise me.

UPDATE::::
I updated the bios to the most recent one and the ram still doesnt work... Im thinking about reseting the csom or whatever but doesnt updating ur bios basically do it?
if i boot with my old ram only it turns on and works fine btw

 

[Iamstrugglingplshelp]

The reason i havent alr updated bios is because I went through the patch notes and the last memory compatibility update was in 2014...

 

[RyzenNoob]

7 RAM Myths and Misconceptions That Really Aren't True

What happens if you mix RAM size? Or completely mismatch RAM modules? Is it good or bad? Here are several RAM myths that need to die!

www.makeuseof.com

 

[Iamstrugglingplshelp]

7 RAM Myths and Misconceptions That Really Aren't True

What happens if you mix RAM size? Or completely mismatch RAM modules? Is it good or bad? Here are several RAM myths that need to die!

www.makeuseof.com

thanks for the reply but... I dont really understand how this will help me fix the issue.

 

[RyzenNoob]

Basically you can’t mix ram sizes

 

[Iamstrugglingplshelp]

Basically you can’t mix ram sizes

this isnt the issue. i tried running with only the new 8gig stick inside it still will not show display

 

[RyzenNoob]

Three questions
1 have you reseated the stick?
2 is the ram stick in the same slot as the 4gb?
3 is the ram compatible with the motherboard?

 

[Iamstrugglingplshelp]

Three questions
1 have you reseated the stick?
2 is the ram stick in the same slot as the 4gb?
3 is the ram compatible with the motherboard?

1. yes multiple time i reseated rebooted like 1000 times
2. ive tried the ram stick with the 4gb in all arrangements and tried it alone in both slots all times did not boot.
3. the ram stick is compatible I went to asus website and looked at their recommended ram sticks for the h81m-e and it is in the list.

 

[Deleted member 14196]

Insert the new ram and take out the old ram and reset your CMOS and then try to boot and tell us what happens

 

[Iamstrugglingplshelp]

Insert the new ram and take out the old ram and reset your CMOS and then try to boot and tell us what happens

ok I will try this out hopefully it works because Im sending back the memory today if it doesnt work

 

[Iamstrugglingplshelp]

ok I will try this out hopefully it works because Im sending back the memory today if it doesnt work

i reset the cmos with the new ram in and it didnt work I believe i got a faulty ram stick or smth because ive checked every single box and it should work I am going to refund this thanks for trying to help everyone.