I HAVE A MACBOOK AIR 2011 AND WHEN IT STARTS UP IT SLOWLY BOOTS UP HALFWAY ON THE INDICATOR BAR BELOW THE LOGO . THEN RESTARTS BOOTING THEN ALL OF A SUDEN A RECTANGLE SHOWS UP AND SHOWS FIRST A FLAT LIKE SCREEN WITH A STARTUP BUTTO N THEN APPEARS A SECOND SCREEN WITH ANOTHER SQUARE OBJECT WITH A CYLINDER HIGLIGHTED. AD JUST KEEPS GOING BACK AND FORTH BETWEEN THESE 2 ITEMS AND DOESNT START UP
