Audio Systems: home system, surge protector, mhc gx450

Question
my mhc-gx450 home system was on the other day,when i turned it up it shut off and wont come back on .what can i do?

Answer
Can you give some specifics?  When you say it shut off, do you mean no audio, no leds?  How long ago did you use it last.  How often do you use it?  It it plugged into a surge protector?  This may seem silly but did you check to see if it's still plugged in, you have to start withe the simplest scenario.  Does anything smell burnt?