Uefi0078 [best] -

Critical. This typically results in a system crash or failure to boot normally.

Dell often releases firmware updates that improve "error handling." Using the Dell Support Site, enter your Service Tag and check for updates to: iDRAC with Lifecycle Controller Chipset Drivers 5. Swap and Test (Isolation) uefi0078

If the error persists and points to a specific slot, try reseating the relevant RAM modules or PCIe cards. Critical

The CMOS battery preserves UEFI settings when the computer is unplugged. A dying CMOS battery can cause settings to reset to defaults, changing SATA mode or disabling boot devices unexpectedly. Swap and Test (Isolation) If the error persists

Modern motherboards support multiple SATA modes: (Advanced Host Controller Interface) and RAID (Redundant Array of Independent Disks). Windows installed in RAID mode will not boot if the BIOS is later switched to AHCI, and vice versa. UEFI0078 appears when the chosen mode does not match the OS installation.

To understand UEFI0078, one must first understand the boot process. When you press the power button on a computer, the Central Processing Unit (CPU) wakes up in a "cold" state. It immediately looks for firmware instructions stored on the motherboard's flash memory. This firmware—modern Unified Extensible Firmware Interface (UEFI)—initiates the Power-On Self-Test (POST).