Thank You for reply, my computer is restart, not shut down ( I try to search about these 2 problem - shut down and restart is different problem )
sorry for type it wrong
i had to search for google about this problem. everyone think this problem is happen because my Power Supply is old and nearly expired. today i buy a new Power Supply but i haven't test it for M&B now. If i try it and hasn't any problem about computer is automatically restart, so that is a cause of problem. I will edit this post again if i try it for 4-5 hours and it will happen or not.
Thank You Again.