How do I stop my MacBook sleeping without a display

Hi all,
I have a MacBook Pro 13 joined up (alongside my PS3) to an Apple 24" LED Display (they are on a switcher - HD620).
However, when I flip over to the HDMI input from the PS3, and therefore the MacBook Pro ceases to be using the 1920x1200 input to the display through MDP, it goes to sleep.
This is a problem for me as I often have background tasks I need doing, or I might only be flicking over to the PS3 for a second or so and then switching back. I therefore want my Mac to keep on running.
Can anyone suggest to me a way to keep my Mac running when there is no display connected - i.e. the lid is closed and the external display is effectively switched off?
Thanks,
Freddie

Hi Freddie,
You would need a third-party app or hack, neither of which I'd recommend (people have trouble with them). If you want to pursue it, google for it and you'll find said apps/hacks/issues.

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