If you use a vertical GPU mount or riser cable:
: Often sold as "Used" or "Seller Refurbished" units, sometimes bundled with CPUs and I/O shields at eBay UK or eBay US . intel motherboard 21 b6 e1 e2
The root cause is almost always :
As this product is discontinued, it is primarily available through secondary markets: If you use a vertical GPU mount or
The code b6 (note the lowercase 'b'—some boards display it as "b6" or "B6") appears slightly later in the POST process. According to AMI BIOS documentation: intel motherboard 21 b6 e1 e2
If it hangs here, the BIOS cannot communicate with your RAM sticks. This is often caused by a faulty RAM module or a dusty slot. Code B6: NVRAM Clean-up [Motherboard] Common Q-CODE(Error CODE) and Troubleshooting