Does Mountain Lion checks for original hardware?? (problem with third-party ram)

Hi all,
I am wondering if Mountain Lion does a hardware check for original hardware. I did a RAM upgrade 6 months ago (from 2x2Gb to 2x4Gb Dolphin 1333Mhz DDR3 on a an early 2011 MacBook Pro) and everything went smooth, I really noticed the upgraded performance.
My problem started after a firmware update (I was running Mountain Leopard). The system became really unstable, with a lot of programs crashing randomly and some crash black screens. I then decided to update to Mountain Lion with a fresh install to solve all the problems and clean up my computer.
I did it from a bootable USB drive using Lion Disk Maker and following these instructions with the harddrive completely formatted: How To Make A Bootable Disk Or USB Drive Of OS X Mountain Lion. The installation got stuck half way through and exited without any error message. After checking the log I got an error code (FAILED TO VERIFY ESSENTIALS PACKAGE). After diggin for a couple of days I found out in an old apple support discussion (Failed To Verify Essentials Package On Installation) that the problem could be the non-original RAM. I then replaced the RAM with the original one and finally was able to install the new OS without problems.
After the OS install and setting up my usual programs, I decided to go back to the upgraded RAM for extra performance and the crashes came back as before. So the newer RAM clearly caused the system to become unstable. So right now I am using the original RAM, I want to get extra RAM but not sure if it was a sporadic problem or it will happen with all the third party memories. Going to the official tecnical service will cost me more than 130€ while buying a third party RAM is around 40€. Is it really Apple pushing us to get original parts or I am just unlucky? Did someone else experienced something similar?

Well, the upgraded RAM worked properly for 5 months straight. I don´t think it is a problem of dirt on the contacts or improper seating. Having the RAM not working properly the same day I want to update the OS, without touching it would be too much of a coincidence I think.
I am going to try the third party RAM again to be sure, trying to clean the contacts just in case, I will post the outcome later.

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