Well i was using my mac the other day when it just decided to switch off and dint come back.

So when my dad sent it to be fixed he said toribash (ingame) takes a lot of the power supply.

Is this true?

It highly depends on if you are using shaders or other GPU consuming options or not. If you use shaders, then you should know that toribash with shaders suck a lot of blood from your computer.

lol software wont cause a psu to fail.. XD

It's not really true, no. If your PSU can't handle your system at full load (i.e. benchmarking), then you should get a new PSU. Simple as that.

Though my country dosent have mac PSU's I have to wait about 10 weeks.
Well anyways thanks for info.