Hi, I have one of the 2011 iMacs that is less than 2 weeks old and ever since I've had it, I've found that the menu bar will sometimes fail to appear on startup. This doesn't happen too often but it worries me that it happens at all seeing as how new the machine is. I've tried repairing the disk permissions in using disk utility but a few boot ups later and the problem reoccurs. I'm new to Macs so I have no idea what is going on. Clicking the finder icon in the dock does restore the menu bar however although I'd rather the menu bar be present every time without me having to do anything.