My roommate was playing with my receiver the other night (Denon AVR-3803), and did something so that now the display does not stay lit up. When you turn on the receiver, it stays lit for about 15 seconds, and then the display turns itself off. The receiver is still functioning fine, and the display will light up again if you adjust the volume, switch the audio source, etc. but again, it will stay lit for a pre-dertermined amount of time, about 15 seconds I think. I'm just wondering if there is a simple setting I don't know about that my roommate may have accidentally triggered? I'm trying to find my manual now, however I just moved so it may be a while before I find it, which is why I'm asking here...