BIOS (Basic Input Output System) from PC’s report errors in the hardware at boot with a code of beeps, that can help diagnose the issue in case there’s no image being displayed.
Error code reported by BIOS during POST (Power On Self Test):
Fatal errors
| # of beeps | Meaning |
|---|---|
| 1 | DRAM refresh error |
| 2 | 640Kb base RAM error |
| 4 | system timer error |
| 5 | CPU error |
| 6 | Keyboard Gate A20 error |
| 7 | Virtual mode exception error |
| 9 | BIOS-ROM checksum error |
Non-Fatal errors
| # of beeps | Meaning |
|---|---|
| 3 | Memory test failure conventional and extended |
| 8 | Monitor error with tracing vertical and horizontal |
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