Message confirmation I am getting the following message and I cannot figure out what to do... "The system intruded, chassis opened or tampered before. Please check the system. Ofcourse I tried closing the computer case, but it still comes up. I have just put this mother board in... does anyone know what I can do?

Hi, have you got this board installed in a case, with all the connections made? Usually there's a two pin connector to a microswitch that detects if the case is open. If you can identify that on the board you can short the switch, fooling the system into thinking the case is closed, to get inot the bios etc.

Turn off the chassis intrusion option in the bios.

Some computer display this message when the case has been opened. After installing components in your computer and closing the case/cover then go into the BIOS setting and reset the chassis intruder detector.

When you open the computer case, a switch is tripped and after the case has been closed and the computer boots up, you get this chassis intruded message.
To clear this message go to the BIOS configuration and then to the chassis intruder detect and then Reset this setting.

This board has an Intruder protection sensor - practically it's a pair of pins (bottom right of the board) with a strap that when removed signals that the case has been opened. Put the strap back and it will be OK.

Your motherboard has a chassis intrusion detector. This just means that someone opened your computer case. Since you did this to change drives all you need to do is reset the detector and you'll be fine. You should have a setting in bios to reset the detector. Hope this helps.

That message means that the side panels of the case of the computer are not closed. You need to replace the side panels if you removed them. And, if you did not, you have a bad intrusion switch. The switch tells the computer that the side panels are open or removed completely. Make sure you screw them back in completely as well.

There is a mechanical switch connector available to determine if someone has opened the chassis.

You can bypass this through the BIOS by entering the BIOS on bootup (DEL? message at bootup? F1?) then look for the system chassis intruder alarm and DISABLE

Another option is to find the pins that the switch is supposed to be connected to (documentation on the ASUS P4B motherboard) and jumper them.

plz disable the chassis open warning option in the bios.

Do you mean the pins for the chassis intrusion on the board are broken off?
if not broken then just jumper them and bypass the switch.