Hello,
My laptop is typing the letter "q" i groups of 4 like that "qqqq" simultaneously. And continuous to do so for a wile - qqqqqqqqqqqqqqqqqqqqqqqqq...
I have a standart PS/2 keyboard. My laptop is Dell Inspiron intel core-i7 running Win7
either the key is stuck down (which typically results in a beeping noise sometime during startup) or the keyboard has a short on that key (that is most likely from a liquid spillage on the keyboard)