hello I am having the same issue with a first gray apple logo after language option then finder logo with saying that I am having a password problem and screen is dark only in the center I can read a little .pls help me with this problem. thank you!

I have Yosemite and didn't update the last versio yet. I open my laptop this morning then I touch the screen a little right after I saw lines with different colours and I turned off the laptop by press down the power button for few seconds. Then I tried to turn on again I got a balck screen with a apple logo in the center I can barely see , I tried resetting nvram and other one also but still same first apple logo then language option press return key after it shows Examining volumes... later it comes a screen with a finder logo I can only read the problem you are having when logging. .. password doesnt work when logging in ...isn't working when typing my password. . These are all î can re ad because of te black screen after this î dont know what to press or do . Excuse my typing . Thank u for help 🙂