RAM slot not working?

Question

laptops

Suddenly, instead of 8 GB of RAM, it became 4 GB.
Could the connector under the bar have broken? The laptop was not dropped, etc.
The bar is working, because the stop. 11 pieces also does not see, although all DDR3.

Answer 1

rest. - the rest There is no need because everything worked, and the bios was reset and even reflashed. (NU VALUE WIZARD CALL)