so i just turned on my laptop then as the password screen showed up i could not type anything. I can't even enter the bios or enter safe mode! is it the keyboard or is it a technical problem with win7?
If it's not under warranty, you can try reseating the keyboard cable at the motherboard connection, though this requires a little bit of technical skill/experience. If you ARE under warranty, then have Lenovo take care of it for you.