Why does my 23 ACD go black  when its USB-hub cord is connected to computer

When I connect the USB - hub cord of my 23 ACD to the back USB port of my G5 quad, the display instantly goes black (shuts of) and back on and to normal operation again, when USB is disconnected. Why is that ? When I start up the computer with the displays USB cord connected and display powered, it turns off when computer starts. Does anyone know
any reason for this or, better still, a fix to this problem ?
G5 quad   Mac OS X (10.4.10)   23 ACD

I have this exact same problem. It is only a recent occurrence and my screen is just about 1 year old. When the USB cord from the ACD is plugged into the back of my Mini, the screen goes black. When the USB cord is removed, the screen powers on as normal. I do get the device removal warning when I remove the USB cord, but other than that, nothing. I've seen in a couple of other posts that this isn't an unusual problem and maybe it's not worth getting it fixed. Is this the consensus? I'm planning to get a USB hub anyway.

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