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ERROR_MCA_OCCURED
What ERROR_MCA_OCCURED means
Windows uses this status when the hardware error architecture reports a machine-check condition. It points below the application layer: CPU, memory, interconnect, firmware, power delivery, or another platform component detected a fault that software could not treat as an ordinary I/O error.
Where it appears
- WHEA records written to the System event log
- unexpected reboot, bug check, or service interruption under load
- hardware diagnostics, firmware validation, or virtualization hosts surfacing a guest-visible machine check
Likely causes
- uncorrectable memory or cache errors
- CPU, motherboard, PCIe, or power instability
- outdated BIOS or microcode
- thermal events or aggressive overclocking
What to collect
- WHEA-Logger event IDs and the complete event XML
- bug-check code and dump, if a crash occurred
- hardware model, BIOS version, CPU microcode, and recent component changes
- temperature, power, memory-test, and vendor diagnostic results
How to respond
Do not hide repeated events with retries. Return the system to supported clocks, update firmware, reseat or test replaceable hardware, and correlate the first WHEA record with the affected bank or device. Escalate persistent uncorrectable reports to the hardware vendor.
References
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