I have a new 2011 Mac Mini Server connected to a Dell u2711. When I first hooked 2 days ago it worked fine. Yesterday when I got home from work, I turned it on and there was no video output to the display. I am running the Thunderbolt port > a mini display port to display port converter > display port cable. Yesterday, I disconnected the cable going into the Thunderbolt port, waited a few seconds, and reconnected. All was fine. Today, I can't get it to work. I know it's not the display or cables because it connects instantly on my MacBook Air Thunderbolt port. What can I do for this problem? I got the entire computer setup. I hope I don't have to exchange yet another computer this month! UPDATE: I just held the power button in until it turned off and turned it back on. Now it works. I shut it down and tried again and it worked. But this is 2 days in a row on day 3 of owning it that I've come home from work and was unable to get it running. And even now, I'm typing this on my laptop! Thanks!