How to solve Acer VX275 boot prompt: warning! Your chassis has been opened?

Do not know when, the home of Acer Desktop (small chassis, model: VX275) When the boot always prompts "warning! Your chassis has been opened ", you need to press F1 to skip before you can enter the system. After the study found that the BIOS setup is incorrect, below on how to solve Acer VX275 boot Prompt "warning! Your chassis has been opened "problem.

1, first, turn the computer back on, press the DEL key to enter the BIOS. (pictured below)

2. After that, move to the BIOS security Features through the keys on the keyboard.

3, then, click Enter to enter the "BIOS Security Features" page (as shown below). You will then see the "Chassis opened Warning" option as "enabled".

4, then, select to Enabled "state, click Enter." The enabled, Disabled, clear three options appear. Select Disabled to prohibit this hint, that is, after the boot will not be prompted. Select ' Clear ' for cleanup, and will be prompted later. You can choose according to your own needs. Generally choose "clear" on the line. Enable is enabled. Select the "Disabled" status here.

5. Then, press ESC to return to the BIOS main page, through the up and down key, select "Exit without saving".

6. Finally, select "OK" in the confirmation of the saved prompt box to complete. It's not going to be this "warning!. Your chassis has been opened "prompted.

 Note:  According to the internet said: Acer VX275, VM275, VM220, VM264 These models will also appear this problem.