My Nitro 5 AN515-58 won't turn on or charge. I left my computer on with things running, and unbeknownst to me it had come unplugged. When I came back an hour later, it was dead. The charging light was off, and the battery light was off. Plugging the power cord back into the computer did not work. I tried holding the power button down for 30 seconds with the power cord plugged in. That did not work. After looking online, I tried holding the power button down for 30 seconds with the charger unplugged then again with it plugged in. That also did not work. Regardless of what I do, not even the charging light will come on.