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Beep Symptoms Symptom / Error FRU / Action in Sequence Continuous beeps. System board One beep and a blank, unreadable, or flashing LCD. 1. Reseat the LCD connector. 2. Reseat the inverter card. 3. Inverter card 4. Video card 5. LCD unit 6. System board 7. DC/DC card One beep, and the message “Unable to access boot source.” 1. Boot device 2. System board One long and two short beeps, and a blank or unreadable LCD. 1. System board 2. Video card 3. LCD unit One long beep followed by four short beeps each time the power switch is operated. (System cannot power-on due to low battery voltage.) Connect the AC Adapter or install a fully charged battery. One beep every second. (System is shutting down due to low battery voltage.) Connect the AC Adapter or install a fully charged battery. (Allow the system to completely shut down before changing the battery.) Two short beeps with error codes. POST error. See “Numeric Error Codes” on page 542. Two short beeps with blank a screen. System board No Beep Symptoms Symptom / Error FRU / Action in Sequence No beep, power-on indicator not on, and a blank LCD during POST. 1. Go to “Power Systems Checkout” on page 533. 2. System board 3. DC/DC card 4. Power sources No beep, power-on indicator on, and a blank LCD during POST. 1. System board 2. DC/DC card 3. CPU card No beep, power-on indicator on, and a blinking cursor only during POST. 1. System board 2. CPU card 3. DC/DC card ThinkPad 770 (9548, 9549) 551
