Unable to advance pass lock screen to login on Windows 10

[JK_949]

I'm running Windows 10 on an HP Pavilion P6 Series. Yesterday, I started to have an issue where I'm unable to advance past the lock screen to enter my pin. Here's the sequence:1. Lock screen appears with the time and date in the lower left corner.2. I tap a key to advance to the login screen to enter my pin.3. The screen goes black.4. The lock screen reappears.I've already tried restarting and running a startup repair. So far nothing's worked. Please help!

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