Stuck on Password Screen after update

I have just updated my Macbook Pro (2011 I think) to Yosemite, however it will not boot now. On the start I get the Password screen but it will not allow me to select any option or enter my password. I cannot bypass this screen.
Can anyone help please.
Thanks.

I have had the same issue of being unable to enter a password when the MBP comes out of sleep mode.   Also;  Safari and Chrome crash often.  Firefox will open but I get error messages.  About a third of my apps won't even open and the MacBook is running at about 60-80% of normal speed since the upgrade;   It takes a long time for the MBP to find and connect to WiFi when in the past, before the upgrade, it was almost instantaneous.
This is the price we pay for upgrading within the first few days of a release.  By default we have become beta testers for Apple.

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