24" Cinema Display USB and Mini Displayport not working

So the USB and Mini Displayport do not work on my cinema display but magsafe does charge. When I disconnect the panel from the logic board the USB functions work like isight,speakers and the hub. How ever when the panel is connected it does not work at all and my computer detects nothing. I changed the all in one cable which did not fix anything and I also changed the logic board still does not change anything. Don’t worry I’m returning both since that didn’t fix anything. I followed the flow guide from Apple and can’t pin point to anything. The monitor show nothing what can be the issue? Could the panel be shorting something out or is the psu being strained? Thanks.

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