Lenovo ThinkPad i Series 1124 ThinkPad 240 User's Reference that shipped with - Page 104
No error codes or messages, The AC Adapter is connected to the computer and the power cord is plugged
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Troubleshooting charts No error codes or messages Problem The screen is blank and you don't hear any beeps. Note: If you are not sure whether you hear any beeps, turn the computer off; then turn it on and listen again. If you are using an external monitor, go to "External monitor problems" on page 104. The screen is blank and you hear a continuous beep, or two or more beeps. Only the cursor appears. Action If a Power-on password is set, press any key to display the power-on password prompt, and then type the correct password and press Enter. If a power-on password is set but does not appear, the brightness control might be set to minimum brightness. Adjust the brightness.If the screen still remains blank, make sure that: The battery pack is installed correctly. The AC Adapter is connected to the computer and the power cord is plugged into a working electrical outlet. The computer power is on. (Press the power switch again for confirmation.) If the screen still remains blank, have the computer serviced. Have the computer serviced. Reinstall your operating system, and power on the computer. If you still have a problem, have the computer serviced. 92 ThinkPad 240 User's Reference