Hypertherm D845GEBV2 - Manual (Page 127)

Error Messages and Beep Codes
127
If POST completes normally, the BIOS issues one short beep before passing control to the
operating system.
Table 83. Beep Codes
Beep Description
1 Refresh failure
2 Parity cannot be reset
3 First 64 KB memory failure
4 Timer not operational
5 Not used
6 8042 GateA20 cannot be toggled
7 Exception interrupt error
8 Display memory R/W error
9 Not used
10 CMOS Shutdown register test error
11 Invalid BIOS (e.g. POST module not found, etc.)