There's nothing in that video which conflicts with the advice on memory management on Microsoft's own website. I suspect that the problem is really related to a motherboard which can't handle that much RAM.
Whether it is or not though, it might be worth removing the additional RAM (to see if Windows will then load) before taking the computer to a repair shop. If Windows does load, then the maximum memory setting can be returned to a lower level.
If you can get Windows working normally, download and run Belarc Advisor in order to obtain a complete profile of the PC:
https://www.belarc.com/products_belarc_advisor
Then, when know exactly which type of motherboard it's got, google to find out the maximum RAM it can handle. (16GB is quite a lot. I've recently upgraded the RAM on my netbook from 1GB to 2GB and on my laptop from 2GB to 4GB. In both cases that's the maximum that the machines can work with).