Error Codes and Beep Codes

This page gives an overview over numerical error codes and beep codes generated by the BIOS.

Numerical Error Codes

IBM provides a detailed listing of numerical BIOS error codes including information on fixes.

Beep Codes

Beep signal	Additional indicators	Meaning
continuous beep		System board failure
one beep	unreadable, blank or flashing LCD	LCD connector problem LCD backlight inverter failure video adapter faulty LCD assembly faulty System board failure power supply failure
one beep	Message "Unable to access boot source"	Boot device failure; system board failure
one long, two short beeps		System board failure Video adapter problem LCD assembly failure
one beep, three short beeps three short beeps, one beep		Memory problem: bad DIMM or bad DIMM slot
one long, four short beeps		Low battery voltage
one beep every second		Low battery voltage
two short beeps	error codes	POST error message
two short beeps		System board failure

External Links Complete list of beep codes for all major BIOS's