Hi,
Are you using USB mouse and keyboard?
If so, you might want to try PS/2 devices. At least a PS/2 keyboard would allow you to input your user and password.
As SMLatCST said, once you are logged you shoud upgrade to 8.2.0 MP2, SEE last release.
You can also try enabling legacy USB support under LENOVO BIOS.
Regards,
LG