Does the rest if it still work? I assume not, but I would start with basuic troubleshooting. It the power adapter plugged in snugly, and does the AC outlet work. If it doesn't turn on, it is likely toast. If it just 'stopped' without specific action, such as lightning or getting kicked, it probably is the power supply. You didn't say what model, so it's hard to know what you are looking at.