Question Lenovo laptop not accepting new DDR3 RAM modules ?

[whit3tiger]

My Lenovo G50-80 laptop (i3 5005u with R5 M330 2GB model) had 2X4GB RAM modules ("SAMSUNG M471B5173EB0-YK0 DDR3 4 GB" and "Hynix HMT351S6EFR8C-PB DDR3 4 GB"), both worked fine and CPUz was showing 1600MHz and 8GB total. The Hynix RAM was purchased in April.
I had to remove the Hynix 4GB module so that I can sell another old laptop with extra RAM. The Samsung module was not working in the older laptop (which I sold).

So my Lenovo G50-80 now only have 4GB RAM (Samsung) and I bought 3x4GB RAMs online and none of them are working! Yes the OS is 64 bit. laptop is not booting with new RAM modules.
Even tried same Hynix HMT351S6EFR8C-PB DDR3 4 GB from the same seller (I previously purchased in April and it was working) and it was also not working. Also tried the same RAM from a different seller, it didn't work either.

Today I tried SAMSUNG M471B5273DH0-YK0 - DDR3L (actually I ordered SAMSUNG M471B5173EB0-YK0 but the seller shipped different)

I tried swapping slots, tried to booth only with the new RAM and none of the methods works.
Even updated the Laptop BIOS to latest available version.

The laptop is not accepting any new RAM it only works with the RAM it came with, which is an old 4GB SAMSUNG M471B5173EB0-YK0.
What could be wrong ?
Is it a motherboard complaint ?
Should I try 8GB module ? but even 4GB module is not working...

Working RAM, came with laptop.

Hynix worked earlier, but newly tried 2 modules (same model number) didn't work. I don't have access to the old Hynix RAM anymore.

 

[Fix_that_Glitch]

Your original ram is pc3L L-meaning low voltage 1.35. Your new ram is pc3 1.50. Your laptap cannot use 1.50 volt ram.

 

[whit3tiger]

Your original ram is pc3L L-meaning low voltage 1.35. Your new ram is pc3 1.50. Your laptap cannot use 1.50 volt ram.

The last tried RAM (today) was SAMSUNG M471B5273DH0-YK0 , it is low voltage.

 

[Fix_that_Glitch]

What is weird is that the same model memory wont work in the same slot you took the old memory out of? The only other difference I can see is the new ram is dual rank and your original is single rank.

 

[SamirD]

Did you make sure that the battery was completely dead/removed before you removed/installed modules. Even the littlest power will zap things and cause problems.

 

[whit3tiger]

What is weird is that the same model memory wont work in the same slot you took the old memory out of? The only other difference I can see is the new ram is dual rank and your original is single rank.

Yes I tried, it didnt work, swapped slots and nothing worked.

 

[whit3tiger]

Did you make sure that the battery was completely dead/removed before you removed/installed modules. Even the littlest power will zap things and cause problems.

I remove battery first even before removing the back panel screws.

 

[SamirD]

I remove battery first even before removing the back panel screws.

Did you press the power button also to remove any remaining voltage?