I'm getting a black screen after BIOS.
After my BIOS displays the HP logo, I authenticate with my password or fingerprint (tried both). Authentication is accepted, I see a
_ in the top-left for less than half a second, and the screen goes black. I left it black for about twenty minutes before giving up.
I've tried this both on battery power and plugged in. (Power has been causing some weird issues lately, Followed this advice.)
My most recent action was to clear the Windows event logs (security log, application log, etc.). I did back these up to files. I performed the clearing through the Windows Event Viewer GUI (Clear Log → Save and Clear).
I am not seeing the "Starting Windows" screen with the four colorful orbs. Booting from a Linux (Mint 14 Cinnamon 64-bit) LiveCD or persistent USB with F9 at startup works fine, and I can access my Windows files.
How can I recover my access to Windows?
HP EliteBook 8440p, Windows 7 Professional 32-bit (on a 64-bit motherboard). Intel Core i5 M540 @ 2.53GHz. 4GB RAM. HP built-in BIOS.
EDIT: I have noticed some activity while my laptop sits at the black screen. One of my connected USB flash drives (with an installation of Linux, if it matters) displays a flashing indicator light intermittently, and I can see the "muted" indicator change from "muted" to "not muted" as the system boots. Pressing the buttons to enable/disable the wireless radio and trackpad causes the buttons to change state but of course I can't evaluate their actual effect because I don't even have a pointer, much less a web browser.