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If the screen is well connected and all the ribbon cables are connected, I would look for anything blocking some part of the IR path. On the inside of the AuraHD's bezel there is a shiny black plastic, with scalloped outside edges, that is IR transparent and guides the IR beams. The IR emitters shine into the scallops and are corner reflected thru the plastic to cross the space just above the screen and thru the black plastic on the other side to the IR receivers mounted on the opposite edge of the PCB from the emitters. It takes very little interference with that path to totally knock out the whole touch function. Just having the bezel with the IR plastic misaligned can do it, but most times it would be some object on the plastic or between the plastic and the IR emitters or receivers.
Luck;
Ken
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