Supermicro system initializing B7 B9 BA BF | Really weird problem with X9DRH-7F

I wanted to share with you guys a really bizarre problem I encountered while testing out some Supermicro X9DRH-7F motherboards. The system is stuck during POST with "system initializing... B7". Usually, when you get codes like this, in particular, the B7, B9, BA, and BF code pertain to memory initialization problems. However, this motherboard was POSTing just fine with all DIMM slots occupied until I added a Nvidia Quadro P400 in one of the PCIe slots. In fact, I later found that the same problem would manifest with the P400 in ANY of the PCIe slots, even PCIe slots not related to the B7 code, which is the first CPU socket. Furthermore, I found a really bizarre way of reproducing this problem, which I will demonstrate in this video. The P400 card used in this demonstration tests just fine without problems in another fully working X9DRH-7F, but on this particular X9DRH-7F, I seem to have problems. Anyway, just wanted to share some troubleshooting tips here if or when you get "System initializing B7 B9 BA BF" codes. But also wanted to share with you guys this bizarre issue you will see in the video. == Links to products and my eBay store front == eBay Partner Affiliate disclosure: The eBay links in this video description are eBay partner affiliate links. By using these links to shop on eBay, you support my channel, at no additional cost to you. Even if you do not buy from the ART OF SERVER eBay store, any purchases you make on eBay via these links, will help support my...