Lenovo ThinkPad T450s, User Manual, Page: 117 / 185

– Use the recovery solutions to restore the system to the factory default state.
If the problem persists, have the computer serviced.
• Problem : My screen goes blank while the computer is on.
Solution : Your screen saver or power management might have been enabled. Do one of the following:
– Touch the TrackPoint pointing device or the trackpad, or press a key to exit the screen saver.
– Press the power button to resume the computer from sleep or hibernation mode.
Beep errors
Table 6. Beep errors
Beeps Solution
One short beep, pause, three short beeps, pause, three
more short beeps, pause, and one short beep (1-3-3-1
beeps) Memory problem. Shut down the computer immediately
and have the computer serviced.
One long and two short beeps Video problem. Shut down the computer immediately and
have the computer serviced.
Three short beeps, pause, one short beep, pause, one
short beep, pause, and three more short beeps (3-1-1-3
beeps)
PCI resource problem. Shut down the computer
immediately and have the computer serviced.
Four cycles of four short beeps TCG
*
-compliant functionality-related problem (might
be the BIOS code validation failure). Shut down the
computer immediately and have the computer serviced.
*
TCG is the abbreviation for Trusted Computing Group.
Five short beeps
System board problem. Shut down the computer
immediately and have the computer serviced.
Five short beeps, pause, five more short beeps, and
pause
TCG-compliant functionality-related problem (might be
the TPM initialization failure). Continue with the boot
process and call the Lenovo service center for technical
support.
Memory module problems
Print these instructions now and keep the instructions with your computer for reference later.
If your memory module is not operating properly, check the following items:
1. Verify that the memory module is installed and seated correctly in your computer.
It might be necessary to remove all added memory modules to test the computer with only the
factory-installed memory modules, and then reinstall the memory module one at a time to ensure
a proper connection.
2. Check for error messages during startup.
Follow the appropriate corrective actions for power-on self-test (POST). See “Error messages” on
page 98.
3. Verify that the latest UEFI for your model has been installed.
4. Verify the proper memory configuration and compatibility including the maximum memory size and the
memory speed.
5. Run diagnostic programs. See “Diagnosing problems” on page 97.
Chapter 8
.
Troubleshooting computer problems
101