Lenovo S200 Hardware Maintenance Manual - Page 84

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. v Checks some basic system-board operations v Checks the memory operation v Starts the video operation v 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 CMOS battery failed Description/Action The CMOS battery is no longer functional. CMOS checksum error - defaults loaded Replace the battery. Checksum of CMOS is incorrect. CPU at nnnn Press Esc to skip memory test HARD DISK INSTALL FAILURE The computer loads the default configuration settings. This error might indicate that CMOS has become corrupt due to a weak CMOS battery. nnnn is the running speed of the microprocessor. Pressing Esc skips the full memory test Cannot find or initialize the hard disk drive controller or the drive. Make sure the hard disk drive is correctly installed. Keyboard error or no keyboard present If no hard disk drives are installed, make sure the hard disk drive selection in Setup is set to NONE. Cannot initialize the keyboard. Make sure the keyboard is properly connected to the computer and that no keys are held pressed during POST. Memory Test: Memory test fail To purposely configure the computer without a keyboard, set the error halt condition in Setup to HALT ON ALL, BUT KEYBOARD. The BIOS then ignores the missing keyboard during POST. This message displays during a full memory test, counting down the memory areas being tested. If POST detects an error during memory testing, additional information appears. This information gives specifics about the type and location of the memory error. 78 Hardware Maintenance Manual