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 beepsMeaning
1DRAM refresh error
2640Kb base RAM error
4system timer error
5CPU error
6Keyboard Gate A20 error
7Virtual mode exception error
9BIOS-ROM checksum error

Non-Fatal errors

# of beepsMeaning
3Memory test failure conventional and extended
8Monitor error with tracing vertical and horizontal

Enjoy! (and if you do, you can Buy Me a Coffee )