Lenovo C100 Lenovo 3000 C100 Hardware Maintenance Manual (Windows 7) - Page 26

Hardware Maintenance Manual 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 Hard disk or optical disk has been Has Occurred 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. 24