Analyzing this from the following problem:- 1. There is error message: cannot access ram, etc. 2. The computer is slow, or stop working (hang), or it is not working smoothly; the computer has to upgrade the ram card.
If there is the problem with the ram card, try to squeeze the ram chips first whether they are loose or not and use the soft cloth clean the yellow part at the edge of the ram card that will be attached to the slot, sometimes the problem arises from the ram chips become loose or the dust at the edge of the card.
When you upgrade the ram card: there are 2 methods 1. Buy the new ram card with the same specification but larger amout of ram to replace the old one. 2. Buy an additional one with the same specification and manufacturer as the first one, and install both of them in the computer, however, sometimes this method does not work (the ram amount is not increased, from my own experience, maybe I did something wrong!).
The following free streaming videos are from www.youtube.com