Mitsubishi Electric LS Pro Hardware Technical Reference page 131

Each time that the computer is powered-up, the power on self test (POST) is executed.
The POST tests:
• processor system
• memory
• hard disk drive
• floppy disk drive and controller
• keyboard
• ROM checksum
• system configuration
• video system
• real time clock
• system timer
• correct boot disk
If all the tests are completed sucessfully, one short beep will be heard from the
loudspeaker in the system unit.
If a failure is encountered, one or more of the following responses will be obtained:
• a blank screen
• no beep or more than one beep
• an error message
If a blank screen is obtained, check that power is applied to both the system unit and
monitor.
Check that all cables are properly connected and that the system is properly configured.
Error beep codes
LS PRO HARDWARE TECHNICAL REFERENCE C/1