See the video in the earlier post.
If comfortable > unscrew applicable screws from the back of the notebook > uninstall the viewable RAM > leave the motherboard DIMM empty > use only the unremovable 4GB RAM module > monitor the computer for stability.
If stable then:
a) replace RAM module with Crucial or another RAM manufacturer's compatible RAM
b) consider whether to pay more for lifetime warranties
c) consider the replacement options: 4GB, 8GB, 16GB
If unstable then:
a) Run Memtest86 > see whether it does or does not find errors
b) If there are errors then contact a local computer store or the manufacturer for servicing
c) If two tests of 4 passes each finds no errors then post new V2 and memory dumps > reassess
.
.
.
.
.
Please remember to vote and to mark the replies as answers if they help.
On the bottom of each post there is:
Propose as answer = answered the question
On the left side of each post: Vote = a helpful post
.
.
.
.
.