BIOS / UEFI Error Codes Directory
Browse an index of bios / uefi error codes in Systems & Devices. Each page uses a stable canonical URL and structured sections.
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20 codes
| Code | Short label | Link |
|---|---|---|
| A DISK READ ERROR OCCURRED | Disk read failure | View |
| BOOT DEVICE NOT FOUND | Boot device unavailable | View |
| BOOT FAILURE | Insert system disk | View |
| BOOTMGR IS MISSING | Boot loader missing | View |
| CMOS BATTERY FAILURE | RTC/CMOS battery issue | View |
| CMOS CHECKSUM BAD | Firmware settings invalid | View |
| CPU FAN ERROR | Cooling issue detected | View |
| DISK BOOT FAILURE | Boot device not bootable | View |
| INVALID PARTITION TABLE | Boot partition issue | View |
| KEYBOARD ERROR OR NO KEYBOARD PRESENT | Input device not detected | View |
| NO BOOTABLE DEVICE | Boot device missing | View |
| NTLDR IS MISSING | Legacy boot loader missing | View |
| OPERATING SYSTEM NOT FOUND | No OS detected | View |
| PRESS ANY KEY TO BOOT | Booting from external media | View |
| PXE BOOT FAILED | Network boot fallback | View |
| PXE-E61: MEDIA TEST FAILURE | Network boot attempted | View |
| REBOOT AND SELECT PROPER BOOT DEVICE | Wrong boot device | View |
| SECURE BOOT VIOLATION | Boot blocked by policy | View |
| SMART STATUS BAD | Drive health warning | View |
| TPM DEVICE NOT DETECTED | TPM unavailable | View |