General

CH-1 and CH-2 Timer (Timing) Error If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: There is an error that involves one of the system timers on the motherboard. Diagnosis: Although this error is usually relates only to a problem …

CPU at XXX (XXX= a reported speed) If you have arrived here through a search engine, and there’s no menu to the left click here! CPU at XXX Explanation: The system is reporting the speed of the processor. On early motherboards, and even some recent vintage such as the Iwill …

Override Enabled – Defaults Loaded If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: The system found that the current BIOS settings in the CMOS memory are invalid or corrupt, and loaded the default settings that are stored in the …

Operating System Not Found If you have arrived here through a search engine, and there’s no menu to the left click here! Missing Operating System or Operating System Not Found ..on boot device or boot sector bad (either hard or floppy disk) Explanation: The system found a boot device, either …

Display type has changed since last boot If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: The BIOS POST has detected that the display type has changed since the last time the PC was booted (started), and there is a …

ROM Checksum Error If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: Some peripheral devices and expansion cards contain executable BIOS code stored in a ROM (Read Only Memory). The ROM has a checksum value in it that is used …

A20 Line or 8042 Gate Memory Errors If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: The system is detecting a failure trying to access the 21st address line, A20. This line is used to provide access to the high …

Display Switch is Set Incorrectly If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: Some older PCs (and we do mean older) have a switch on the motherboard that can be toggled between “monochrome” and “color”, instead of having a …

CMOS Display Type Mismatch If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: The system has detected that the type of video card actually installed in the PC is not the same as the one you selected in the BIOS …

Error Encountered Initializing Hard Drive If you have arrived here through a search engine, and there’s no menu to the left click here! Explanation: The BIOS POST process has detected a failure with one or more of the IDE/ATA hard disk drives in the system. The error appearing on the …