Australian i-Tech Nav System Touch Screen Broken?

Hi guys,
I have no idea if this is even the right place to post this, but basically I need some advice.
I've got a 2010 Prius i-Tech, and the touch screen on my stereo/Nav system whatever has stopped working. It literally worked one day, the next day, nothing.
I can dismiss the "I agree" page if I keep trying to find the "sweet spot" , so it's not completely dead which confuses me more.
Can the touch screen be fixed? Could it just be a loose wire behind the head unit maybe? My dealer was no help to me. They just wanted me to shell out the $5000 for a new head unit.
If it's not fixable, does anyone know where (in Australia, because I'm assuming the US model head unit won't work in mine) I can get a second hand unit? I've tried eBay and gumtree to no avail.

 

Salvage is turning up nothing but the base model stereo, don't want to go the aftermarket route, as I have the auto parking and everything reliant on the head unit.
I've found a few US spec Nav systems on eBay.
Would they even work with the Aus Prius?