Yosemite Mac unable to type password at login?

Hi guys,
I updated to Yosemite two days ago, and today it has started giving me issues. Twice today I had to forcibly shut it down at the login page because it would not allow me to login. I have looked at the other posts on this site, and my laptop is not having the same problem. For most other people, the issue is that it takes too long to actually get in the computer, but my problem is that I am unable to even type my password. For some letters that I press that are not in my password, and for numbers too, they register. But for ones that are in my password, it won't register and the laptop makes the sound it makes when one issues a nonexistent command.
Do you guys have any idea what's going on with my laptop?
Much thanks,
Luckiicloverxx

Sounds like a hosed installation. Best bet is to boot with the Snow Leopard install disc and reinstall. If successful, then try the update again.

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