Once you have successfully made the driver work and the Intel desktop board boots:
Code E2 is where 80% of users searching "intel desktop board 21 b6 e1 e2 driver work" actually need help. E2 indicates the motherboard is attempting to execute legacy option ROMs—typically for:
When an option ROM driver is corrupt, missing, or incompatible, the board freezes at E2. intel desktop board 21 b6 e1 e2 driver work
If your board is a legacy product (discontinued), use the Intel Download Center:
Intel manufactured dozens of desktop boards (DP35DP, DG45ID, DH67CL, etc.). The sequence 21-B6-E1-E2 appears most commonly on Intel 5-series, 6-series, and legacy 4-series chipsets (P55, H55, H67, Z68). Once you have successfully made the driver work
Find your exact model:
Without the exact model (e.g., Intel DH67CL or Intel DP55KG), driver work becomes guesswork. When an option ROM driver is corrupt, missing,
The memory reference code (MRC) driver, which initializes the integrated memory controller, has failed. This usually happens after: