Laptop keyboard no response.

Hi, I have had fresh re-format my Lenovo T61 laptop, after re-format sometime the keyboard seem to be unresponsive (example: on the power, login to windows, keyboard no response or windows go to standby mood keyboard will auto disconnected, have to force restart).

Pressing the Num Lock, pressing tab, putting in a few external keyboards also no response. I have tried getting to the settings on start-up but because the keys won't work I can't even find the problem.

Hope that anyone can help. Thanks....