I was typing too quickly on my small laptop keyboard, I don't know which key or combination of keys I typed but all of a sudden the keyboard didn't work anymore. I'm using a newly bought (about 3 months) Lenovo X61 and I was nowhere near the function key and the NumLock. I don't get any strange characters - I get NO characters! The keyboard appears to have stopped working! Is there any key I can type to activate the keyboard again?

Try plugging in a usb keyboard and see if that works firstly .