Why this exists
In April 2026, my HP Z620 workstation started crashing. Ten unexpected reboots in thirty days. The Windows Event Log kept showing the same cryptic message:
EventID 41 · Kernel-Power · "928 Fatal PCIe error · Slot 5 · Surprise link down"
I searched HP's documentation. Four pages of "contact a certified technician." I searched forums. Twenty-three years of conflicting advice from people who had different motherboards.
So I did what any sysadmin would do: I instrumented everything. PowerShell scripts logging CPU temps every five seconds. WHEA error correlation. PCIe link speed monitoring. Then I fed the logs to an AI and asked it to reason about the data.
The answer came in thirty seconds. Probabilistic diagnosis. Plain English. Specific reseat instructions. It identified the CPU2 riser as the likely culprit — something three pages of HP documentation never mentioned by name.
That's FIELDCTRL. AI that actually understands hardware events. Not monitoring. Not alerts. Reasoning.