iPad screen not working

My iPad Screen comes on, but dark blue with nothing there, just a faintly recognizable light behind it. Reset procedure with the home and lock buttons did not restore the normal screen. Linking to iTunes did not restore it either, although iTunes could read the iPad. Tried to install the newest software upgrade even with the dark screen. It was working up until the very end when there was an error message, then it disconnected, but the screen still did not come back on. No Apple logo appears, although going through the reset operation seems to turn something on and off, just nothing I can see or make do anything. As far as I know, the iPad was about 70% charged before all this started. It was working fine earlier today.