Make sure you flip the switch on the power supply. If you're using a CRT monitor, you'll need to buy a new one in Australia.

Thanks!  I flicked the switch on the back of the PC and the monitor auto switches so I'm finally up and running.

 

Power down under can run as high as 250v with 265v peaks sometimes higher.
A good surge supressor is in order and the unit should be unplugged when not used.

These high voltage spikes can quickly destroy your system.

High Voltage Spike Defintion: High voltage spikes occur when there is a sudden, rapid voltage peak of up to 6,000 volts with a duration of 100mS to 1/2cycle These spikes are usually the result of nearby lightning strikes, but there can be other causes as well. The effects on vulnerable electronic systems can include loss of data and burned circuit boards.

Transients.
Normal duration is shorter than a spike and generally falls in the range of nanoseconds.
Switching Transients Definition: Switching transients take place when there is a rapid voltage peak of up to 20,000 volts with a duration time of 10 MicroSeconds to 100 micro seconds. They are commonly caused by arcing faults and static discharge. In addition, major power system switching disturbances initiated by the utilities to correct line problems may happen several times a day. Effects can include memory loss, data error, data loss and component stress.