problems with keyboard

[Lumi]

hi i hope somebody can help my please
my problem is my keyboard when i plug in serial port is not working properly
sometimes is making my clicks double sometimes don't recognize my clicks then i bout a adapter to switch is USB port, now is working good but sometimes is blocking and i have to unplug and then to plug again to make it
work. Please somebody help my please

[barbaduci]

Try this few steps. Take one good keyboard (one that you know that is working) plug it in the port, and if it is working - your keyboard is a problem. If it is working like the old one, then your port is a problem, try to use USB keyboard.