I purchased a 24" Cinema display a few weeks back for use with my uMBP and within the first week noticed that the display went black while I was using it and then came back on. Initially I dismissed it and thought that I must have knocked a cable but it then happened a few more times while I was using it on different days/weeks. The speakers and other devices plugged into the USB port continue to work when it happens so I am sure it is not a mains power problem. I spoke to AppleCare and after resetting the PRAM hoping that would fix it, they are collecting it for repair . I am hoping they are able to identify the problem as it's a great monitor other than this issue but as it is quite intermittent it is hard to find a pattern. Has anyone else had this problem and found a fix?