The Aser e5-571G laptop does not see the second RAM chip. What to do?

Question

RAM

I decided to add 4 more GB to the 4 available GB.
Why doesn't he see the second RAM chip? The second one is 1.5 V.
It does not see one either - the laptop does not turn on, the black screen. Tell me what to do?

Answer 1

Perhaps the second die is not working properly and therefore the laptop does not turn on. Try replacing it with another one.

Answer 2

The problem is nutrition. It turned out at 1.5 V does not see the plate. The laptop saw DDR3L RAM with 1.35 V.