Hey guys I was fixing an ipad 2 for my daughtes school and this happened to me.. I found a video on you tube that shows you how to repair the backlight thing.All I could think was great I now owe the school an ipad.. it showed that it can happen when the device is switched on when the lcd is disconnected.. (I know this Ipad was on when I disconneted it as I had already cut the digitizer cable and was trying to remove the shattered glass and bumped the button so I couldnt turn it off).. However back to the point.. if you shine a light on the screen (I used my phone) you can see it enough to turn it off.. I turned the ipad off.. about 10/15 minutes later I went to show a friend what had happened and I was so relieved to see that apple logo.. :) hope this helps...