Intel Desktop Board 01 21 B6 E1 E2 Er [extra Quality] -

The sequence (often appearing on labels as /21-B6-E1-E2 ) is not a specific motherboard model name like "DH61CR." Instead, it is part of Intel's regulatory and manufacturing markings typically found on the physical board or I/O shield.

This diagnostic code appears when the detected RAM does not match the type of memory the motherboard expects. For example, if your motherboard requires memory but standard non‑ECC DIMMs are installed, the system will display E2 . intel desktop board 01 21 b6 e1 e2 er

When you press the power button, your computer doesn't just start up. It first performs a rapid, rigorous self-check known as the POST, testing essential components like the CPU, memory, and storage. This process is managed by the motherboard's UEFI/EFI firmware. The code sequence you see is a specific diagnostic tool used during this process, providing far more detail than a simple beep. The sequence (often appearing on labels as /21-B6-E1-E2

If you own this board and are seeing 01 21 b6 e1 e2 er during boot failure → first. If you’re documenting this string for a database → It’s likely a manufacturing identifier (less useful for repair). If it’s an error code → It is not a standard Intel POST code ; check your manual for your specific board series (e.g., DQ67SW, DZ77BH, etc.). When you press the power button, your computer

These numbers usually denote the hardware revision and the specific production batch. A higher number typically implies a later revision of the board (addressing initial bugs or manufacturing updates).

This specific sequence is not actually a unified model number. Instead, it is a combination of a partial (often associated with the regulatory mark E210882 ), hardware revision flags, and a factory-assigned MAC address physical label .