HP laptop won't go to password screen

Product Name: HP Pavilion 15 Notebook PC
Operating System: Microsoft Windows 8.1 (64-bit)

I press the power button.
Computer powers up.
I see the Windows 8.1 logo and the doting thingy that goes in a circle.
After a minute, when the password screen is supposed to show up it simply goes blank (black).

Please help and thank you.
 
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