My computer worked fine last night but I forgot to plug it in before turning in. This morning the screen was black and it wouldn't start so I plugged it in. A little while later I tried to start it and it just goes beep beep beep until I take the battery out. When I try to start again, the beeping starts all over again. I have an appointment for Tuesday afternoon to see about fixing it, but is there anything I can try in the mean time?