Dear Chanphirun!
Possible Causes
Cause 1: The basic BIOS is damaged.
Cause 2: The extended BIOS is damaged.
Cause 3: The BOOTROM database is damaged.
Cause 4: The system control switch and timing board is faulty.
Procedure
Replace the alarmed board.
There are many descriptions of replacement boards. If you need, please provide your email address.
Thank you!