Help, "Chassis intruded!" error message

[MadMacs]

Hey, just started up my pc for the first time, And on the screen there is an error message that reads

"Chassis intruded !
Fatal Error...system Halted.

It appears as soon as i start up and I can't enter the bios!.

I have a a8n32-sli-deluxe motherboard.

I have no idea what to do. I've checked all my connections and they seem fine.

Does anybody know what I can do?

thanks

 

[MadMacs]

How do I do this?

thanks!

 

[MadMacs]

Thanks you very much guys, Without you I would have hade to pay someone to fix it.

Cheers.