Lenovo 3000 C100 All-In-One - Manual (Page 26)

Hardware Maintenance Manual
24
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 system-board 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 Battery Low The CMOS battery is no longer
functional.
Replace the battery.
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.
SATA Device Configuration Change
Has Occurred Hard disk or optical disk has been
changed.
Mouse not found No mouse is detected. You can plug
a mouse.
Keyboard not found No keyboard is detected. You can
plug a keyboard.
System Halted The system has been halted. A reset
or power cycle is required to reboot
the machine. This message appears
after a fatal error has been detected.
Press TAB to show POST screen Pressing the TAB key permits the
user to toggle between the default
POST display screen and a custom
POST display screen.