Hello all… I’d like to add some information for those who are still struggling with this. Just a bit more of a clue, as I managed to briefly get my 24” Cinema Display to work today. Also, a cautionary tale… as I immediately fried it right after. I’ve tried pretty much everything on this and several other threads to no avail. Today, I thought I’d give it one more go before pitching the Cinema Display into the bin. I took it all apart, put it back together while checking for loose connections. I left the glass off and the LCD connected, but not screwed down, in the hopes that I could check some connections while it was powered on. I do NOT recommend doing this. It was simply a last-ditch attempt on my part. In the image below, you will see the heavy black cable that connects to the Logic board. I’m not entirely certain what this is, but when I unplugged it, and then plugged it back in, the monitor started working! Full brightness, brightness control returned, etc. I went about trying to repeat this, to...

Thank you for all the suggestions throughout this and other threads. I’m still having an issue with my 24” LED Cinema Display. I can get it to work with the brightness all the way down, but once I try to raise the brightness, it begins to blink and eventually goes black. I have a short video of this behavior here: https://youtu.be/4UoOGBID95I I tried taking the display apart and reseating all the connections. Does anyone else have any other things I should try?

Also, notice there is a thick and thin side to the bumper, and the thin side should be on top, or toward the back panel.