BIOS beep codesIBM Thinkpad BIOS beep codesContinuous beeping - 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 long, four short beeps - Low battery voltage
One beep every second - Low battery voltage
Two short beeps with error codes - POST error message
Two short beeps - System board failure
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