LENOVO general symptom

One beep and a blank, unreadable, or flashing LCD:
    Reseat the LCD connector
    LCD assembly
    External CRT
    System board

One long and two short beeps, and a blank or unreadable LCD.
    System board
    LCD assembly
    DIMM

Two short beeps with error codes.
POST error. See Numeric error codes for more help.

Two short beeps and a blank screen. 
    System board
    DIMM

Three short beeps, pause, three more short beeps, and one short beep. 
    DIMM
    System board

One short beep, pause, three short beeps, pause, three more short beeps, and one short beep.
    DIMM
    System board

Only a cursor appears.     
    Reinstall the operating system

Four cycles of four short beeps and a blank screen.
    System board (Security chip)

Five short beeps and a blank screen.
    System board



No beep symptoms

No beep, power-on indicator on, LCD blank, and no POST. 
    Make sure every connector is connected tightly and correctly
    DIMM
    System board

No beep, power-on indicator on, and LCD blank during POST. 
    Reseat DIMM
    System board

The power-on password prompt appears. 
    A power-on password or a supervisor password is set. Type the password and press Enter.

The hard drive password prompt appears. 
    A hard drive password is set. Type the password and press Enter.

The DOS full screen looks smaller.     
    Start the ThinkPad Configuration program and set the Screen expansion function.