Intel Desktop Board 21 B6 E1 E2 Manual Better | [best]

The codes are BIOS POST codes – not model numbers. Your board model is likely one of these (check the silkscreen on the board):

If the computer still turns on, you can find the model without opening the case: intel desktop board 21 b6 e1 e2 manual better

If your system hangs during boot with these alphanumeric codes, it usually indicates a power or initialization error. The codes are BIOS POST codes – not model numbers

The model name is typically displayed on the initial splash screen when you first power on the computer. Common Boards with the "21 B6 E1 E2" Marking intel desktop board 21 b6 e1 e2 manual better

Physical components marked with these characters typically feature an LGA 1155 socket supporting 2nd or 3rd Gen Intel Core processors, or function as specialized industrial/embedded hardware modules.