I am at a new workplace, they have an Apple 30" for me. The display starting going on/off after a day or 2 working on it (its been in use before). I kept messing with the cords and cables, and thought it was the power brick (the 110w brick). So, I had that replaced. Now a few days later, it's flickering again. Just goes from normal, to totally black. It is hooked up to a new MBP 17" with the 9400/9600 GT card, and is using the Dual Link DVI - Displayport adapter to connect to the ACD30". Well, I had thought it was the power supply, but now that is replaced, so what else could it be? I realize that "the monitor itself" is a good answer, but I am thinking it's more likely a problem with the displayport -> Dual link adapter, which itself is plugged into the ACD's pigtail adapter with the USB and FW400 plugs, or my MBP's video card and the display port. What is up with this? How can I go about diagnosing this and figuring out why this is happening? I really don't want to have to tell them I need a new ACD30", since they might not replace it, but without a power supply problem, could it be a adapter problem? Or a video card problem? Anything but a monitor problem.