I having this problem when play game but the screen freezing so I press ALT F4 but it wont close but instead goes dark.. laptop still power on at indicator and the charging as well.. I manually shut down my laptop using Hold the power button.. And then I turn on again my laptop.. I was wondering and I try to press ALT F4 with music on nd then screen goes black again and the music stop but the power indicator is still on.. I try again to know what the problem.. and then I found it.. I hold Press ALT and screen goes black when no program running.. How I can fix it?