BIOS set up

That just means the case of the desktop was opened by someone.

http://phubner.eng.ua.edu/Files/Optiplex%20GX620/advfeat0.htm#wp1124663

Security Chassis Intrusion Detection NOTE: When the administrator password is enabled, you must know the administrator password before you can reset the Chassis Intrusion setting. This feature, if installed and enabled, detects that the chassis was opened and alerts the user. To change the Chassis Intrusion setting:

1. Enter system setup.
   
   
2. Press the down-arrow keys to move to the System Security option.
   
   
3. Press <Enter> to access the System Security option's pop-up menu.
   
   
4. Press the down-arrow key to move to the Chassis Intrusion setting.
   
   
5. Press <Enter> to select an option setting.
   
   
6. Press <Enter> again after you update the option setting.
   
   
7. Exit and save system setup.
   
   

Option Settings

• On - If the computer cover is opened, the setting changes to Detected, and the following alert message displays during the boot routine at the next computer start-up:
  
  

Alert! Cover was previously removed.

To reset the Detected setting, enter system setup. In the Chassis Intrusion option, press the left- or right-arrow key to select Reset, and then choose On, On-Silent, or Off.

• On-Silent (default setting) - If the computer cover is opened, the setting changes to Detected. No alert message appears during the boot sequence at the next computer start-up.
  
  
• Off - No intrusion monitoring occurs and no messages appear.

Make sure case is fully closed and intrusion switch is fully engaged. Boot to the BIOS (F2 on most systems) go to security section, reset intrusion switch. save settings, reboot.

There is a jumper that resets the bios clock password etc...etc
You need to locate it 3 pin set 1 jumper and look for <norm/reset> in small white print.
Self explanitory

Hi there.
Start the PC and enter the bios using either the Esc or Del key, once in the bios set the chassis intrusion to "disabled" save the changes and exit the bios, the computer will now restart and you should be able to boot into the operating system no problem.

Good luck and thanks for using FixYa!!

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.

boot in bios and reset the intrusion to read and clear it out alot of times the bios will use its backup when cleared clear the ir setting as weel and remove any passwords in the security setting in the bios if you are using a pov card you may have to take it and reset the machine then disable the card funtion reinstall then reset the card from there

Open Your system and there is a Battery which looks like a Coin. that is CMOS Battery (CR2032) Change that battery and then Reboot your system and try go to BIOS menu with DEL , F11 , F1 or F2. Either of these Buttons can Work.

This will resolve your issue

You need to go into your BIOS and disable chassis intrusion detection. You can get into your BIOS usually by pressing either F!, F2, DEL, or F10 when the computer boots up. Check with your motherboard manual or look on the startup screen for the correct key.

Hi, Muhammad, It sounds to like you have been infected with a virus and will need to run an antivirus program at bootup. If you are unable to do this yourself then it is not a big job for a computer technician to do for you. Regards mistyman

There is normally a system tamper reset within the bios settings somewhere. Alternatively try to reset by the JBAT1 terminal by putting jumper from pins 1-2 to pins 2-3 then back again and restart pc. You will have to set the time again and make sure the HDD is detected in standard bios settings and re start.