Found this message at startup, I can only enter BIOS. I didn't touch the jumper (is in the right place on the right as show on manual) and i didn't connect any intrusion sensor.
Suggestions?
Thanks
Also this: http://wemakeitsimple.blogspot.co.uk/2013/04/how-to-solve-chassis-is-intruded-fatal.html
Moved some cable very colse to the board and disconnected some cable from mobo near the intrusion connector and now the problem seems disappeared. Hope will be enough. Thanks!