FIX : 912 - THE COMPUTER HAS BEEN REMOVED IN THE HP COMPAQ

On the Desktop computer HP Compaq  after opening the cover of CPU case (altough it has been closed back again), when starting the computer,  there will be the alarm tone sound is quite disturbing.And we must press the F1 key to continue loading the OS (Operating System).

warning: 
error  912 - The computer has been removed. The machinecover has been removed
since last system start up.

To solve this problem:

• Turn the computer on
• Press F10 to enter the BIOS setup, wait for about 10 seconds
• Find the Hardware Monitor Setup menu (use arrow keys), select then press enter

• On Reset Case Open Status, change value  from Disable to Enable (use + on the numeric pad on the right side of the keyboard to change the value)
• Press F10 to save the configuration, press Enter.

Courtesy : http://potools.blogspot.in