Hello! Any help greatly appreciated. I have a Lenovo U330 Touch and while using it this afternoon it shut down. I thought it had overheated, so I waited for it to cool down and turned it back on. It ran for about 20 mins and then shut off again. Now it won't turn back on at all. The power cord is working - the light is on and I do not have a removable battery. When I hit the power button, the keypad lights turn on for a second and then nothing happens.