My iMac 21.5 is less than two months old. When I tilt the screen even slightly (as you're supposed to be able to do) the machine shuts down. Totally. And I can't get it back for 5 minutes (today I timed it!). This can't be right. I can't find anyone discussing this and as it's the Easter weekend here, telephone support from Apple is not functioning. I'm going to call Apple on Tuesday after the holiday, but I'm really worried about this. This is my first Mac and it's really precious to me! Has anyone else had this problem and are there any solutions? Thanks in advance.