Lenovo C205 All-In-One - Manual (Page 24)

Hardware Maintenance Manual
22
POST error codes
Each time you power-on the system, it performs a series of tests that
check the operation of the system and some options. This series of tests is
called the Power-On Self-Test, or POST. POST does the following operations.
• Checks some basic motherboard operations
• Checks the memory operation
• Starts the video operation
• Verifies that the boot drive is working
If the POST detects a problem, an error message appears on the screen.
A single problem can cause several error messages to appear. When you
correct the cause of the first error message, the other error messages
probably will not appear on the screen the next time you turn on the
system.
POST Error Message Description/Action
CMOS Date/Time Not Set The CMOS Date and/or Time are
invalid. This error can be resolved
by readjusting the system time in
Phenix BIOS Setup.
CMOS Checksum Bad Checksum of CMOS is incorrect.
The computer loads the default
configuration settings. This error
might indicate that CMOS has
become corrupt due to a weak
CMOS battery.
Primary Master Hard Disk Error The IDE/ATAPI device configured as
Primary Master/Secondary Master
could not be found or initialized.
Make sure the hard disk drive is
correctly installed.
Secondary Master Hard Disk Error
Keyboard error Cannot initialize the keyboard.
Make sure the keyboard is properly
connected to the computer and
that no keys are held pressed
during POST.
To purposely configure the
computer without a keyboard, set
keyboardless operation in Setup to
Enable. The BIOS then ignores the
missing keyboard during POST.