Try tossing a pail of water on it, if that don't wake it up it's curtains...
If your amplifier is not coming on while hooked up, there is a good chance something inside is fried. If you have some minor electrical know how, pop the cover and look over the board for broken connections or metly badness. If you still can't find it, get someone to look at it for you that knows what to look for (this step may cost money)