I have a Lenovo Ideapad Y570. The ribbon cable that's attached to the keyboard won't go in all the way. One side appears to go deeper than the other. When I turn on the computer, the keyboard doesn't work properly. It does, however lock the ribbon in place, so it's not coming loose.
I removed the keyboard in the first place to clean a stuck key after my son dumped watermelon juice on it. Prior to removing the keyboard, it functioned just fine, save for a sticking shift key.