Another way to go;
My switch at the last rig went limbo. I opened the case and removed the cables and shortcut them. (So this made the switch bypassed in practise it was always pressed "on".) Then I took tha mains cable and instead of putting it back in the mains outlett in the wall I put it into one of theese things with four or five outlets and a mains switch on them. (I think you know what I mean.) Then I also put the mains cable for the monitor and the printer there. Since then that rig is turned on/off by using that switch, everything is turned off at the same time. (Technical: In fact that switch with a red light brakes both the cables to the main power, the third cable (ground) is not broken, this means I let the cable stay if I open the case and know that everything is grounded, practical).
This is it; cheap, practical, safe and easy replaceable. And a picture as I don't know the word in English:
