It is very unfortunate to say that these RAM sticks are dead:
They were an essential part of my laptop for some time now but ultimately decided to fail on me. I always put my laptop to sleep, but when I reached home, the machine would try to boot and then suddenly shut down, and restart on its own trying to boot. I took out the RAM sticks and tested one at a time, but it was a no go. Fortunately, I have more RAM sticks laying around so I installed another 2 spare 4GB RAM sticks and the machine booted! Not only did it booted but I think the boot was faster. No idea why, because both the new and old RAMs are 1600Mhz/s and are of the same capacity, although different brands.
So, now my laptop is usable again 🙂