One out of three times I start my computer from standby, it just starts to a black screen. I hear the speakers turn on (however, music does not play - just a slight hiss that occurs when the computer turns on) but I cannot do anything on the computer (touching the black screen does not get any response).

In addition to this, I was wondering if anybody knows a way to have the computer shut down after being in stand-by for, say, more than an hour or some specified amount of time.