Im unable to login when i switch on the laptop? please help me out.

hello,
yesterday I installed os yosmite  on MacBook pro. today im unable to login when I switch  on, my laptop. please help me out as soon as.

Hi, I have a similar problem. When I try to log in all I get is a light greyish screen. absolutely nothing else, I wish now that I had not loaded Yosimite. I have tried to Safe Start - to no avail. it is very frustrating and I think apple should not use this technology until it is properly set up. However that does not solve my problem. Can anyone assist me ASAP. Thankyou John  L

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