Hate to be like this, but I was wrong again. The box is not entirely dead, but blinks read (for the first time it behaves like this, I haven't physically looked at the box until now, today). Timestamp in IML entry roughly matches dmesg time (off by 20 minutes after a week looks normal to me). So it _is_ the cause (?).
"ID","Severity","Class","Last Update","Initial Update","Count","Description", "100","Critical","OS","09/05/2025 20:57","09/05/2025 20:57","1","User Initiated NMI Switch", "99","Critical","System Error","09/05/2025 20:57","09/05/2025 20:57","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "98","Critical","OS","09/05/2025 19:12","09/05/2025 19:12","1","User Initiated NMI Switch", "97","Critical","System Error","09/05/2025 19:12","09/05/2025 19:12","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "96","Critical","OS","08/31/2025 04:01","08/31/2025 04:01","1","User Initiated NMI Switch", "95","Critical","System Error","08/31/2025 04:01","08/31/2025 04:01","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "94","Critical","OS","08/29/2025 17:04","08/29/2025 17:04","1","User Initiated NMI Switch", "93","Critical","System Error","08/29/2025 17:04","08/29/2025 17:04","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "92","Critical","OS","08/29/2025 14:48","08/29/2025 14:48","1","User Initiated NMI Switch", "91","Critical","System Error","08/29/2025 14:48","08/29/2025 14:48","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "90","Critical","OS","08/26/2025 09:47","08/26/2025 09:47","1","User Initiated NMI Switch", "89","Critical","System Error","08/26/2025 09:47","08/26/2025 09:47","1","Unrecoverable System Error (NMI) has occurred. System Firmware will log additional details in a separate IML entry if possible", "88","Caution","POST Message","08/25/2025 20:46","08/25/2025 20:46","1","POST Error: 1785-Slot X Drive Array Not Configured", "87","Informational","POST Message","09/05/2025 19:21","08/25/2025 20:45","13","POST Information: Processor 1, DIMM 2 could not be authenticated as genuine HP SmartMemory. Enhanced and extended HP SmartMemory features will not be active.", "86","Informational","Maintenance","[NOT SET] ","[NOT SET] ","1","IML Cleared (iLO 4 user:me)",
