Had a strange problem with my 2.5ghz Penryn wasn't sure on the type of crash it was strange, Black screen slid down like a curtain then a window in the middle asking me to power down hold the power button and restart, was a strange request never seen it before. I am asking because is it built into leopard or has anyone else experienced a black window sliding down the screen then asking to restart the machine? a Virus... silly question to ask but I am unsure seemed very generic for a crash! Laptop was very hot at the time, had thunderstorms all day and the battery was recharging aswell as photoshop open with a very large layer'd PSD. Would appreciate your input many thanks.