Mac won't load, No bootable device, Keyboard not working nothing! help!

Hello! I need some help here....
I tried to bootcamp my Mac so I can run windows 7 and Mac OS X together
Followed instructions... Put the USB boot drive in..
Didn't recognice Drivers so I decided to start again and cancelled. (my mistake obviously!)
Now it is saying No Bootable Device - Press any key to continue, the keyboard will not work, it won't do anything! help!
Any advice on how where to start?
Martin

Thanks, I tried that at first, but my keyboard wasn't even working!...
Eventually (for anyone else reading this!), plugged in another USB keyboard and it recognised that and then got into Mac os X from that!
Thanks for your time!
msussams

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Mac won't load, No bootable device, Keyboard not working nothing! help!

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