Welcome,
Just turn off and put your hand on the tower case to discharge your body of static electricity and then unplug the PC .....open the side of the tower put your memory in and re-start your PC and it should be recognised.
Just turn off and put your hand on the tower case to discharge your body of static electricity and then unplug the PC .....open the side of the tower put your memory in and re-start your PC and it should be recognised.