I have read on the APPLE FORUM that the 23" Cinema Display has many problems regards to potentially faulty powerbrick ($95 to replace) or other hardware issues. Also read that these displays starts to "zombie sleep" (i.e. does not wake up from sleep) after one year of use. So many users ended up either unplugging/plugging the powercord from the powerbrick until the display starts to work. But I have also read that a simple PRAM reset fixed the "zombie sleep" problem. So, I'm a bit confused.