| Feature | Requirement to clear "21 b6 e1 e2" | | :--- | :--- | | | Intel D945GCCR / D945GCL | | RAM | 1x 512MB DDR2-533 (Low Density, Single Rank) | | CPU | Pentium 4 531 (3.0GHz, 800 FSB) – Not Core 2 Duo | | PSU | Minimum 250W with 4-pin 12V connector | | BIOS Version | 0049 or lower (Older BIOS have stricter timings) |

If you have stumbled upon the search term "Intel Desktop Board 21 b6 e1 e2 specification" , you are likely staring at a black screen with two blinking green LEDs, or you have found a debug LED readout on a legacy Intel motherboard. You are not alone.

In this article, we will break down the technical specification of the error, the motherboard families it affects, and the step-by-step hardware specifications you need to know. First, let’s clear up the most common confusion. There is no Intel Desktop Board model named "21 b6 e1 e2."

This specific sequence is not a model number. It is a generated by older Intel Desktop Boards (specifically the D945GCCR, D945GCL, and D101GGC models). Understanding this code is the key to reviving a dead system or finding compatible replacement parts.