Beep Symptoms - Lenovo ThinkPad T520 Hardware Maintenance Manual

Table 3. Error messages (continued)
Symptom or error
This system does not support batteries that are not
genuine Lenovo-made or authorized. The system will
continue to boot, but may not charge unauthorized
batteries.
Attention: Lenovo has no responsibility for the
performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out
of their use.
The connected AC adapter has a lower wattage than the
recommended model which was shipped with the system.
This will increase the time to charge the battery, and
system performance will be adjusted to match the
available power.
Please connect the AC adapter which was shipped with
the system for best system performance.
Press the ESC key to continue. Docking station is
removed or its ID is different, press F3 to power off
system and restore correct docking station, press F4 to
normal boot.

Beep symptoms

Table 4. Beep symptoms
Symptom or error
One beep and a blank, unreadable, or flashing LCD.
One long and two short beeps, and a blank or unreadable
LCD.
Two short beeps with error codes.
Two short beeps and a blank screen.
Two or more beeps, or a continuous beep. Operating
system starts successfully.
Three short beeps, pause, three more short beeps, and
one short beep.
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep.
Only the cursor appears.
Four cycles of four short beeps and a blank screen.
Five short beeps and a blank screen.
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ThinkPad T520, T520i, and W520 Hardware Maintenance Manual
FRU or action, in sequence
Replace the battery.
Charge the ac power adapter.
FRU or action, in sequence
1. Reseat the LCD connector
2. LCD assembly
3. External CRT
4. System board
1. System board
2. LCD assembly
3. DIMM
POST error. See "Numeric error codes" on page 40.
1. System board
2. DIMM
If a mini-PCI Ethernet card is installed, confirm that Alert
On LAN 2 in ThinkPad Setup is disabled.
1. DIMM
2. System board
Reinstall the operating system.
System board (security chip)
System board