Chassis opened intrusion - Acer Aspire M1201 Athlon X2 320 Gb PC Desktop

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.

> chassis intrusion

There can be a sensor inside the case, that is "tripped" whenver the side-panel of the case is opened, i.e., somebody has removed the side-panel, in order to remove some components, e.g., RAM, or add-in adapter card. So, if it was a "thief" (an "intruder") that opened the case, to expose the "insides", check that nothing was stolen. But, if it was you that opened the case, then enter BIOS SETUP, and "clear" that "chassis intrusion" status.

For the chassis intrusion circuit to work, the chassis power supply must be connected to AC power. By default, on the motherboard the pin labeled chassis "signal" and "ground" are shorted with a jumper cap. You need to remove the jumper caps if you intend to use the chassis intrusion
hope this helps

Resetting the Chassis Intrusion Detector Turn on (or restart) your computer. When the blue DELL? logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your computer and try again. Select the Chassis Intrusion option and then press the left- or right-arrow key to select Reset. Change the setting to On, On-Silent, or Disabled. Hi, Above is the procedure for resetting the switch. This is directly from the on-line manual. If this does not work, just comment back. Thanks for using Fixya,.

Depnding upon model Acer use one of the following to enter the bios settings:-
F1, F2 or CTRL+ALT+ESC

I guess this happens without your PC case open yes?

two options are available to you
1 - Check to ensure motherboard is earthed properly to the case (make sure the board is screwed in properly on the mounting posts. This is the usual reason why the intrusion error malfunctions.
2 - disconnect the chassis intrusion wire from the motherboard if 1 isn't the cause.

You need to check the chassis intrusion pin setting located on the motherboard. See page 1-30 (Number 11) in your manual.
You need to add a jumper as shown.
The system should no longer halt.

Cheers!
Mike

very simple shut down computer put side panel back on and restart go into bios and under the settings somewhere you will see enable chassis intrusion. Just disable that. If you put cover back on then proceeded by turning power on and you still get this error than it is time to clear CMOS and then you must go into the bios and hit setup default and then go into any timings and voltage settings for CPU Memory and such. and also disable the chassis intrusion. You can enable it at anytime. just as long it is not powered up when removing side panel. I hope this is helpful.

I read a solution of your problems, i did not ry this. But i want you to try in your motherboard: this was qoute by
" 9. anonobomber, 07-05-2002 09:51 read the manual from your motherboard, I'll quote it for you; Chassis Intrusion Lead (4-1 pin CHASSIS) This requires an external detection mechanism such as a chassis intrusion monitor/microswitch. The sensor is triggered when a high level signal is sent to the Chassis Signal Lead, which occurs when a panel or light detector is triggered. This function works with an optional ASUS CIDB chassis intrusion module (see your vendor for more details). If the chassis intrusion lead is not used, a jumper cap must be placed over the pins to close the circuit.
pinout 1[+5volt] [power supply standby] [chassis signal] [ground]
in order to supress the messages you are getting you will need to get a jumper to fit over the chassis signal and ground to bypass the chassis intrusion detection circuit.
This has nothing to do with resetting the CMOS. For board specific locations of the pins check http://www.asus.com.tw for the manual pertaining to your motherboard"

If you're refering to the chassis intrusion... (Which is what I'm assuming.)

There should be a switch in the case itself that release itself when you open the case. Make sure that it is properly placed and angled and that it is connected to the appropriate pins on the motherboard. (Often labeled "CH INTR" or something to that effect.)

There is also usually a function in the motherboard's BIOS that enables/disables the chassis intrusion alert. Check to make sure that the function is enabled in the BIOS. (Don't forget to save your settings!)

There may also be a jumper on the motherboard that enables/disables the chassis intrusion detection. (Although this is less common.) Check around for that if the other options aren't making themselves apparent to you.

Good luck with that. Hope I was on the right topic. :P

Cyryl