I have an advent 8315

Question

i have an advent 8315 and last week i powered on and connected to the internet when it just shut down. All lights went off and would not restart or turn on since.Have never had the battery in it use only the mains adapter. Bought new mains adapter still no lights or power. My warranty ran out a month ago and my local pc world is being refurbished.I ave no clue what to do