Defective laptop

I had bought a new Inspiron 5000 series laptop and it's motherboard became defective within a month. So it was changed and i was ensured nothing would happen. Now again i am not able to power on my laptop. Sometimes it dosent respond. I have to click 10-15 times to turn it on and many times it shows some errors which were corrected by Dell support. But still sometimes laptop shuts down by itself and dosent turn on. I need this repaired asap or please provide a replacement for my laptop. My EX is 7301485371