I recently started my computer and noticed that it wasn't recognizing a stick of RAM, so I took it apart, and took out a stick of RAM in an attempt to find out which one wasn't working. When I turned it back on I got this screen about the Memory being changed, and instead of letting my computer boot up, I turned it off.
I then changed out the bad memory stick for the good one I took out, and the next time I turned the computer on, the monitor, mouse, and keyboard refused to work. None of the lights on the mouse or the keyboard come on, and the monitor displays "is working properly, but no connect(or something similar to that). I checked all my connections, and nothing has worked.