SOMETIMES WHEN TURNED ON MY ACER ASPIRE T180 DOESNT GET PAST THE LOGO SCREEN.OTHER TIMES WHEN USING IT PC FREEZES AND SAYS NOT RESPONDING. NOTHING WORKS, AND I HAVE TO PRESS OFF BUTTON AND HOLD UNTIL OFF. THIS SECOND PROBLEM SEEMS TO HAPPEN WHEN FIRST TURNED ON WHEN TURNED OFF AND THEN ON AGAIN IT DOESNT HAPPEN