My Lenovo Y500 laptop is less than 6 months old. After it remained idle for 1 month when I powered the laptop there was initial flickering. Soon after I hear a loud noise of spark from within and the screen became blank. The laptop stopped working. I had to press the start button to power off the laptop. Thereafter, the laptop starts when the power button is pressed but after a while I hear a loud sound of spark and the laptop stops working. Please help.