2nd Display LED won't turn off

I have a G5 with 2 23" Apple Displays connected to the Radeon 9600 video card. All is working well, but on shutdown the LED on 2nd Display (DVI-2 outlet on card) refuses to go off! If I unplug power supply then connect it back immediately the light will go off, but I see no reason why I would need to do this every time. Discussed with tech support 3 times, the 2nd time in parts were replaced, each time I get it back the same thing still happens. A new video card from Apple did not solve the problem either. Is the video card unable on shutdown to control both displays?? Any suggestions?
G5 Dual 2.0   Mac OS X (10.4.4)   Dual 23" Display
G5 Dual 2.0   Mac OS X (10.4.4)   Dual 23" Display

By the way, I own Dual 20" and I have run into this before. It took me a while to figure out that the problem goes away when the USB is connected. Before I figured it out, it was driving me crazy too.

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