This laptop is 2 years old, and I’ve never had one problem with it. Before I noticed it was broken, it had been sitting on my desk powered off unplugged for a few days. I then put it into a laptop case and walked to my friends house and opened it. The computer would turn on but the screen wouldn’t. When it was “sleeping”, I couldn’t fully power it off, I could hear a faint whizzing noise from the screen. Any ideas as to the problem?