I can hear the unlock/lock sounds but my Nook HD's screen wont turn on
On Friday night the tablet ran itself down and shut off after watching some movies before bed. The screen and the rest of the tablet was functioning normally up to this point. I didn't bring my charger home with me from school, so it stayed dead for a few days. The tablet is now fully charged (or at least almost full. I left it on the charger overnight and this morning when I unplugged it I couldn't get the screen to turn on. At first I thought I forgot to plug the charger into the wall, but now I realized that the tablet *is* on, but the screen wont come on. My computer reads the device, and I can transfer files to/from.
When I hit the power/home button I immediately get a lock/unlock sound. Holding the power button to try to hard reset just makes it make the lock sound twice. Any advice here? Is my screen dead?