You mention its a laptop - is this a full size keyboard (with the "10"/"Numberpad") or an external keyboard (USB) ? 
What't the make/model of laptop? 
 
This is an old thread, but worthy of an additional comment: some CMOS, BIOS settings configure the NumLock key on startup to be either up or down. I'm not sure about how UEFI handles it yet. 
Incidental Note
If you're on a laptop, typing in a password and it's not accepting it, consider at least two things:
- Caps Lock, the obvious first choice, and
 
- NumLock, which remaps UIO->789, JKL->456, etc.
 
DAMHIKT.