My Proscratch 2 display stopped working, when I opened it up, I found that one of the capacitors on the power supply circuit board had exploded. The 26V rail was dead. I tried replacing the caps, but it was still broken.

The unit is out of warranty.

Does anyone have any idea how much a replacement power supply would cost, where I can get one, or where I can get it serviced here in Sydney, Australia?

it is only the 26 V rail as I plugged in my working units power supply and everything worked fine.