Lenovo ThinkPad 390X User's Reference for ThinkPad 390 - Page 113

No Error Codes or Messages, Problem, Action

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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 again, and listen again. If you are using an external monitor, go to "External Monitor Problems" on page 111. The screen is blank and you hear a continuous beep, or two or more beeps. Action 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. (Turn on the power switch again for confirmation.) 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, have the computer serviced. Have the computer serviced. Chapter 4. Solving Computer Problems 97

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Troubleshooting Charts
No Error Codes or Messages
Problem
Action
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
again, and listen
again.
If you are using an
external monitor, go to
“External Monitor
Problems” on page
111.
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. (Turn on the power switch again for confirmation.)
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, have the computer serviced.
The screen is blank and
you hear a continuous
beep, or two or more
beeps.
Have the computer serviced.
Chapter 4.
Solving Computer Problems
97