For some reason I read your post as Remote Robot and assumed you'd built something really cool.

We use an APC SNMP controlled power switch (AP9212 with AP9606 card) which works really well although it's expensive. This would switch the whole machine off then on again.Other than that, you could always buy one of those phone controlled mains switches, I'm sure Maplin used to sell something like that. You ring it up, enter a pin and then you can switch the appliance on and off.

This company sell one

EDIT: Correction, this just seems to point back at Maplin although it does give a product number: A94BK