Look for a small barcode label with a number starting with "AA" (e.g., AAD53350-205 ). This is the most accurate way to identify your board.
If the official Intel link is archived, sites like eBay often list detailed physical specs for these used boards. Technical Troubleshooting & Drivers
Intel has discontinued its "Desktop Board" product line and has moved many documentation assets. To find the exact specification for your specific board version: intel desktop board 21 b6 e1 e2 specification link
Intel Desktop Board 21-B6-E1-E2 w/ Intel i5-2300 4GB ... - eBay
If the board fails to POST, check for BIOS version compatibility, especially when using 3rd Gen Intel CPUs on older 2nd Gen boards. Look for a small barcode label with a
Standard legacy connectivity including USB 2.0, USB 3.0, Ethernet (RJ-45), and various video outputs like VGA, DVI, or DisplayPort depending on the specific model variant. How to Find Official Specification Links
For Windows 7 and legacy 32-bit/64-bit systems, drivers are usually available through the Intel Download Center . Standard legacy connectivity including USB 2
DDR3 SDRAM . Most boards with this footprint feature two DIMM slots supporting dual-channel configurations.
LGA 1155 (Socket H2), supporting Sandy Bridge and some Ivy Bridge processors.