I just turn computer off and open the case and see where it is located and what type it is.
remove it carefully if I can reach it.
get a new one of the same type and put it in , close it up and reboot.
But I haven't had to do it for many years, so MB could be different now.

But here's some links with proper instructions.

http://www.google.com/search?q=Chang...ient=firefox-a